| One-man boat | 12 |
| One-man bands, e.g. | 19 |
| One-man band, e.g. | 18 |
| One-man band's rendition, e.g. | 34 |
| One-man band performances | 25 |
| One-man band instrument, often | 30 |
| One-man band | 12 |
| One-liners, e.g. | 16 |
| One-liners | 10 |
| One-liner, often | 16 |
| One-liner, for one | 18 |
| One-liner, e.g. | 15 |
| One-liner that stings | 21 |
| One-liner producer | 18 |
| One-liner master | 16 |
| One-liner man Youngman | 22 |
| One-liner legend Youngman | 25 |
| One-liner from the pulpit? | 26 |
| One-liner expert | 16 |
| One-liner deliverers | 20 |
| One-liner | 9 |
| One-lens eyewear | 16 |
| One-legged whaler | 17 |
| One-legged support | 18 |
| One-legged protagonist | 22 |
| One-legged maneuver for those chocolate balls? | 46 |
| One-legged literary character | 29 |
| One-legged captain of fiction | 29 |
| One-legged captain | 18 |
| One-legged camera stand | 23 |
| One-legged ballet pose | 22 |
| One-lane highway annoyance? | 27 |
| One-lane | 8 |
| One-L person, in an Ogden Nash poem | 35 |
| One-L lama | 10 |
| One-kind link | 13 |
| One-kind connector | 18 |
| One-kind connection | 19 |
| One-inch putt, e.g. | 19 |
| One-inch pencils, for example | 29 |
| One-inch pencil, say | 20 |
| One-inch pencil, for example | 28 |
| One-inch pencil, e.g. | 21 |
| One-inch news story | 19 |
| One-in-fifty status | 19 |
| One-in-a-million thing | 22 |
| One-in-a-million | 16 |
| One-in-a- million | 17 |
| One-I Nash subject | 18 |
| One-hundredth part: Abbr. | 25 |
| One-hundredth of a mil, to a hood | 33 |
| One-hundredth of a balboa | 25 |
| One-hundred-meter sprint | 24 |
| One-humper | 10 |
| One-hoss ___ | 12 |
| One-hoss vehicle | 16 |
| One-hoss shay's owner | 25 |
| One-hoss shay's creator | 27 |
| One-hoss shay man | 17 |
| One-hoss et al. | 15 |
| One-horse-too-many town | 23 |
| One-horse ___ | 13 |
| One-horse vehicles | 18 |
| One-horse vehicle | 17 |
| One-horse towns | 15 |
| One-horse town | 14 |
| One-horse conveyance | 20 |
| One-horse carriages | 19 |
| One-horse carriage of India | 27 |
| One-horse carriage | 18 |
| One-horse | 9 |
| One-horned fish | 15 |
| One-horned beasts | 17 |
| One-horned beast, for short | 27 |
| One-horned animal | 17 |
| One-hit wonders, e.g. | 21 |
| One-hit wonders with the 1999 hit "Steal My Sunshine" | 63 |
| One-hit wonder? | 15 |
| One-hit wonder, e.g. | 20 |
| One-hit wonder with "Informer" | 40 |
| One-hit wonder that totally ripped off the Postal Service for its 2009 #1 hit "Fireflies" | 99 |
| One-hit wonder of 1984 | 22 |
| One-hit wonder named after lead singer Gabriele Kerner's nickname | 69 |
| One-hit wonder born Gabriele Kerner | 35 |
| One-hit wonder Basil | 20 |
| One-hit wonder | 14 |
| One-handed Norse god | 20 |
| One-handed a liner | 18 |
| One-half of our species, roughly | 32 |
| One-half of a fluid oz. | 23 |
| One-half of a fl. oz. | 21 |
| One-half fluid oz. | 18 |
| One-half fl. oz. | 16 |
| One-half base x height, for a triangle | 38 |
| One-half and three-fourths | 26 |
| One-half and one-half | 21 |
| One-grape wine | 14 |
| One-grained wheat | 17 |
| One-fourth of this clue's number | 36 |
| One-fourth of quadri- | 21 |