| Onassis et al. | 14 |
| Onassis and others | 18 |
| Onassis and Fleischer | 21 |
| Onassis familiarly | 19 |
| Onassis | 7 |
| Onagers: Fr. | 12 |
| Onagers | 7 |
| Onager, in Oise | 15 |
| Onager, for one | 15 |
| Onager, for example | 19 |
| Onager, e.g. | 12 |
| Onager treading insect? | 23 |
| Onager or dunce | 15 |
| Onager | 6 |
| On: Prefix | 10 |
| On/off ___ | 10 |
| On/off wall device | 18 |
| On/off switch | 13 |
| On/off routes | 13 |
| On/off ramp pattern | 19 |
| On/off points: Abbr. | 20 |
| On-___ (rumor) | 14 |
| On-___ (bit of gossip) | 22 |
| On-track Bobby | 14 |
| On-tour baby watcher | 20 |
| On-time tax return? | 19 |
| On-time stat, perhaps | 21 |
| On-the-way-out PC component | 27 |
| On-the-water front | 18 |
| On-the-town time for many | 25 |
| On-the-spot TV programs | 23 |
| On-the-spot reporter | 20 |
| On-the-spot name | 16 |
| On-the-spot canvass of voters | 29 |
| On-the-spot appraisal | 21 |
| On-the-sly meeting | 18 |
| On-the-sly event | 16 |
| On-the-rise Taiwanese PC maker | 30 |
| On-the-rack item? | 17 |
| On-the-playing-field animal | 27 |
| On-the-nose | 11 |
| On-the-job training slogan | 26 |
| On-the-job trainee | 18 |
| On-the-job reward | 17 |
| On-the-job protection org. | 26 |
| On-the-job learner | 18 |
| On-the-job extras | 17 |
| On-the-job extra | 16 |
| On-the-hour radio offering | 26 |
| On-the-green golf strokes | 25 |
| On-the-go Sony devices, for short | 33 |
| On-the-go morning snack | 23 |
| On-the-go meals | 15 |
| On-the-go group | 15 |
| On-the-go diva? | 15 |
| On-the-floor exercise | 21 |
| On-the-cob treat | 16 |
| On-the-cob serving | 18 |
| On-target | 9 |
| On-tap serving | 14 |
| On-stage blunders | 17 |
| On-site supervisor? | 19 |
| On-site shucking sites | 22 |
| On-site day care, perhaps | 25 |
| On-screen TV schedule | 21 |
| On-screen trash can, for one | 28 |
| On-screen trash can, e.g. | 25 |
| On-screen surgery resident | 26 |
| On-screen stereotypes | 21 |
| On-screen stand-in | 18 |
| On-screen ship? | 15 |
| On-screen read | 14 |
| On-screen plane? | 16 |
| On-screen OB/GYN | 16 |
| On-screen nephrologist | 22 |
| On-screen medic | 15 |
| On-screen lists | 15 |
| On-screen image | 15 |
| On-screen effect | 16 |
| On-screen avatar | 16 |
| On-road vehicle requirement since 1996 | 38 |
| On-ramp sign | 12 |
| On-ramp posting, perhaps | 24 |
| On-ramp pattern | 15 |
| On-ramp | 7 |
| On-or-off switch | 16 |
| On-off switches | 15 |
| On-off switch, e.g. | 19 |
| On-off switch type | 18 |
| On-off switch | 13 |
| On-off control | 14 |
| On-off connector | 16 |
| On-off connection | 17 |
| On-off button: abbr. | 20 |
| On-of link | 10 |
| On-location broadcasts | 22 |
| On-line? | 8 |
| On-line wiki for a popular sci-fi TV show | 41 |
| On-line V.I.P.'s | 20 |
| On-line V.I.P. | 14 |