| One of the ref's set | 24 |
| One of the reeds | 16 |
| One of the Reds' rivals | 27 |
| One of the Redgraves | 20 |
| One of the Redgrave sisters | 27 |
| One of the Red Sox pitchers | 27 |
| One of the red Monopoly spaces | 30 |
| One of the recent frosh | 23 |
| One of the Reagans | 18 |
| One of the Rayong throng | 24 |
| One of the ratites | 18 |
| One of the Rat Pack | 19 |
| One of the rare earths | 22 |
| One of the rappers | 18 |
| One of the Rams' QB's | 29 |
| One of The Ramones | 18 |
| One of the rails | 16 |
| One of the Radcliffe graduates | 30 |
| One of the races | 16 |
| One of the R's, synonymously | 32 |
| One of the R's of R&R | 29 |
| One of the R's in the USSR | 30 |
| One of the R's in J.R.R. Tolkien | 36 |
| One of the Queen's pets | 27 |
| One of the Quechuan people | 26 |
| One of the Quad Cities, in Illinois | 35 |
| One of the Quad Cities | 22 |
| One of the Prozorov sisters | 27 |
| One of the Prize guys | 21 |
| One of the principles of Kwanzaa | 32 |
| One of the Princetonians | 24 |
| One of the primates | 19 |
| One of the primal gods in Greek myth | 36 |
| One of the pride of Joy | 23 |
| One of the prexy's staff | 28 |
| One of the Presleys | 19 |
| One of the Prairie Provinces | 28 |
| One of the Power Rangers | 24 |
| One of the Poor Clares | 22 |
| One of the pool ends | 20 |
| One of the pool balls | 21 |
| One of the Ponderosa boys | 25 |
| One of the Poles | 16 |
| One of the Pointer Sisters | 26 |
| One of the Plinys | 17 |
| One of the Pleiades with a month named after her | 48 |
| One of the Pleiades | 19 |
| One of the planets | 18 |
| One of the Planeten | 19 |
| One of the Plain People | 23 |
| One of the plagues | 18 |
| One of the Pirates of Penzance | 30 |
| One of the Pirates | 18 |
| One of the Pine Islands | 23 |
| One of the Pillars of Islam | 27 |
| One of the Pillars of Hercules | 30 |
| One of the phys. sciences | 25 |
| One of the phobias | 18 |
| One of the Philippines | 22 |
| One of the Pharaohs | 19 |
| One of the PGA tours | 20 |
| One of the Petes | 16 |
| One of the pet set | 18 |
| One of the Perons | 17 |
| One of the Pequod's owners | 30 |
| One of the Pep Boys | 19 |
| One of the people responsible for "Spider-Man: Turn Off the Dark" | 75 |
| One of the people conquered by Cyrus | 36 |
| One of the Penns | 16 |
| One of the Pennines | 19 |
| One of the Pelican State natives | 32 |
| One of the Parnassus nine | 25 |
| One of the Parkers | 18 |
| One of the Parcae et al. | 24 |
| One of the Papas | 16 |
| One of the Palins | 17 |
| One of the Palin children | 25 |
| One of the pairs in a dead man's hand | 41 |
| One of the Pac-Man ghosts | 25 |
| One of the Pac-Man characters | 29 |
| One of the Osmonds | 18 |
| One of the Orkneys | 18 |
| One of the Orkney Islands | 25 |
| One of the original top-level domain name endings | 49 |
| One of the original Seven Sisters colleges | 42 |
| One of the original Politburo members | 37 |
| One of the original Not Ready for Prime Time Players | 52 |
| One of the original Mouseketeers | 32 |
| One of the Original Kings of Comedy | 35 |
| One of the original Baby Bells | 30 |
| One of the original 16 HTML Web colors | 38 |
| One of the original 13: Abbr. | 29 |
| One of the original 13 colonies: Abbr. | 38 |
| One of the original 13 colonies | 31 |
| One of the original 13 | 22 |
| One of the original "Charlie's Angels" | 52 |
| One of the orig. Southern Colonies | 34 |
| One of the orig. 13 | 19 |
| One of the Oranges | 18 |
| One of the opposition | 21 |