| One of the original 13 | 22 |
| One of the original 13: Abbr. | 29 |
| One of the Orkney Islands | 25 |
| One of the Pac-Man characters | 29 |
| One of the Pac-Man ghosts | 25 |
| One of the Palin children | 25 |
| One of the Parcae et al. | 24 |
| One of the Parnassus nine | 25 |
| One of the Philippines | 22 |
| One of the phys. sciences | 25 |
| One of the Pillars of Islam | 27 |
| One of the Pine Islands | 23 |
| One of the Plain People | 23 |
| One of the Pointer Sisters | 26 |
| One of the Ponderosa boys | 25 |
| One of the Poor Clares | 22 |
| One of the Power Rangers | 24 |
| One of the Prairie Provinces | 28 |
| One of the prexy's staff | 28 |
| One of the pride of Joy | 23 |
| One of the Princetonians | 24 |
| One of the Prozorov sisters | 27 |
| One of the Quad Cities | 22 |
| One of the Quechuan people | 26 |
| One of the Queen's pets | 27 |
| One of the R's of R&R | 29 |
| One of the Rams' QB's | 29 |
| One of the rare earths | 22 |
| One of the Rayong throng | 24 |
| One of the recent frosh | 23 |
| One of the Red Sox pitchers | 27 |
| One of the Redgrave sisters | 27 |
| One of the Reds' rivals | 27 |
| One of the ref's set | 24 |
| One of the Rhine Maidens | 24 |
| One of the Righteous Brothers | 29 |
| One of the Ringling Brothers | 28 |
| One of the rivers of Hades | 26 |
| One of the Rockefellers | 23 |
| One of the Rolling Stones | 25 |
| One of the Roman Fates | 22 |
| One of the Royal Family | 23 |
| One of the Rushmore quartet | 27 |
| One of the S's in SST | 25 |
| One of the S's in U.S.S. | 28 |
| One of the sales force | 22 |
| One of the sales staff | 22 |
| One of the same bloodline | 25 |
| One of the San Juan Islands | 27 |
| One of the sandbox set | 22 |
| One of the Scottish gentry | 26 |
| One of the services: Abbr. | 26 |
| One of the seven basic tastes | 29 |
| One of the seven continents | 27 |
| One of the seven conts. | 23 |
| One of the seven deadlies | 25 |
| One of the seven deadly sins | 28 |
| One of the Seven Dwarfs | 23 |
| One of the Seven Hills | 22 |
| One of the Seven Sisters | 24 |
| One of the Seven Wise Men | 25 |
| One of the Seven Wonders | 24 |
| One of the Sex Pistols | 22 |
| One of the SI base units | 24 |
| One of the Siamese twins | 24 |
| One of the simple machines | 26 |
| One of the singing chipmunks | 28 |
| One of the singing Gibbs | 24 |
| One of the singing Guthries | 27 |
| One of the singing Jacksons | 27 |
| One of the singing Rosses | 25 |
| One of the six inert gasses | 27 |
| One of the Smothers Brothers | 28 |
| One of the Snopes family | 24 |
| One of the Society Islands | 26 |
| One of the space missions | 25 |
| One of the Spice Girls | 22 |
| One of the Spice Islands | 24 |
| One of the Staal brothers | 25 |
| One of the Staple Singers | 25 |
| One of the states of matter | 27 |
| One of the steeplejacks | 23 |
| One of the stethoscope set | 26 |
| One of the Sunda Islands | 24 |
| One of the Teletubbies | 22 |
| One of the Ten Plagues | 22 |
| One of the Teutonic Fates | 25 |
| One of the three B's | 24 |
| One of the Three Bears | 22 |
| One of the three D's | 24 |
| One of the three dimensions | 27 |
| One of the three estates | 24 |
| One of the three Furies | 23 |
| One of the three Graces | 23 |
| One of the three HÂ’s | 24 |
| One of the Three Musketeers | 27 |
| One of the three R's | 24 |
| One of the Three Rivers | 23 |
| One of the Three Stooges | 24 |
| One of The Three Tenors | 23 |