| On poor umpiring: "Macbeth" | 37 |
| On Saturn, it's about 10 hours | 34 |
| On Social Security, typically (abbr.) | 37 |
| On the "Index Librorum Prohibitorum" | 46 |
| On the "Queen Mary 2", maybe | 38 |
| On the -- (at risk of exclusion) | 32 |
| On the black market, most likely | 32 |
| On The Border restaurant offering | 33 |
| On the father-of-the-bride's mind | 37 |
| On the first train out of here, perhaps | 39 |
| On the large side, in women's shoes | 39 |
| On the left half of the no. line | 32 |
| On the left side of the no. line | 32 |
| On the loose, after "at" | 34 |
| On the lower side, in a heeling vessel | 38 |
| On the mend, say, as one's arm | 34 |
| On the mother's side of the family | 38 |
| On the mother-of-the-bride's mind | 37 |
| On the other side of the street: Abbr. | 38 |
| On the receiving end of a Dear John letter | 42 |
| On the right half of the no. line | 33 |
| On the way home the klutz often _____ | 37 |
| On the way to the bus stop to ___ ... | 37 |
| On the ___ (Colorado baseball blog) | 35 |
| On the ___ (fleeing from the police) | 36 |
| On the ___ (preparing for battle) | 33 |
| On the ___ (under consideration) | 32 |
| On the ___ wavelength (in accord) | 33 |
| On which an arabesque is performed | 34 |
| On which dinero doesn't grow | 32 |
| On your face, it's embarrassing | 35 |
| On ___ (doing some heavy drinking) | 34 |
| On ___ (experiencing continued success) | 39 |
| On ___ (fresh from the grapevine) | 33 |
| On ___ (having successive successes) | 36 |
| On ___ (how magazine articles might be written) | 47 |
| On ___ (how some pranks are done) | 33 |
| On ___ (how some things are built) | 34 |
| On ___ (in trouble with the boss) | 33 |
| On ___ (like much freelance work) | 33 |
| On ___ (made without commitment) | 32 |
| On ___ (needing no human intervention) | 38 |
| On ___ (proceeding independently) | 33 |
| On ___ (proceeding successfully) | 32 |
| On ___ (with no assurance of sale) | 34 |
| On ___ (without assurance of payment) | 37 |
| On ___ basis (for testing purposes) | 35 |
| On ___ with (not speaking to, perhaps) | 38 |
| On ___ with (of equal magnitude) | 32 |
| On ____ : 1951 Danny Kaye film | 32 |
| On ____ Majesty's Secret Service | 36 |
| On ____: per detailed directions | 32 |
| On ____: with no assurance of sale | 34 |
| On _____ (freelancer's terms) | 33 |
| On-air performers, in TV advertising | 36 |
| On-board prognostication device? | 32 |
| On-line aid for shoppers' stops | 35 |
| On-line businesses, collectively | 32 |
| On-line chat components, for short | 34 |
| On-line news distribution system | 32 |
| On-line wiki for a popular sci-fi TV show | 41 |
| On-road vehicle requirement since 1996 | 38 |
| On-the-go Sony devices, for short | 33 |
| Once again part of an athletic clique? | 38 |
| Once Broadway's longest-running show | 40 |
| Once in a while (with "now") | 38 |
| Once powerful city-state of ancient Greece | 42 |
| Once-again fashionable soulful rock instruments | 47 |
| Once-autonomous people of southern Russia | 41 |
| Once-common "commonly" | 32 |
| Once-common desert fighting force | 33 |
| Once-common monochrome PC display | 33 |
| Once-common urban skyline sights | 32 |
| Once-dominant industry in Pittsburgh | 36 |
| Once-homeless "Golden-Voiced" Williams | 48 |
| Once-in-a-lifetime exchange, maybe | 34 |
| Once-in-a-lifetime trip, for some | 33 |
| Once-popular children's TV character | 40 |
| Once-popular diet soft drink, or part of the can | 48 |
| Once-powerful republic of NW Italy | 34 |
| Once-prominent Arby's competitor | 36 |
| Once-trendy Hollywood workout routine | 37 |
| Once-ubiquitous black-on-yellow image | 37 |
| One ''A'' in Paris | 34 |
| One "a-leaping" in a Christmas song | 45 |
| One "Arab Spring" nation | 34 |
| One "caught" on grainy film | 37 |
| One "coming" in a Three Dog Night hit | 47 |
| One "E" on a scoreboard | 33 |
| One "hissed" in a melodrama | 37 |
| One "in de cold, cold ground" | 39 |
| One "out" in la la land | 33 |
| One "tamed" in Shakespeare | 36 |
| One "Tarzan" portrayer | 32 |
| One about Jerry Springer debuted in 2003 | 40 |
| One above the Lötschberg Tunnel | 34 |
| One accepting the world as it is | 32 |
| One accustomed to the pole position? | 36 |
| One actor, or two American presidents | 37 |
| One actress, or two British prime ministers | 43 |