| One-dimensional: Abbr. | 22 |
| One-dimensional figure | 22 |
| One-day replacement, often | 26 |
| One-customer connector | 22 |
| One-customer connection | 23 |
| One-consonant instrument | 24 |
| One-chevron G.I.'s | 22 |
| One-celled protozoan (Var.) | 27 |
| One-celled protozoa (Var.) | 26 |
| One-celled pond dwellers | 24 |
| One-celled organism (Var.) | 26 |
| One-celled microorganisms | 25 |
| One-celled creatures (var.) | 27 |
| One-billionth: Comb. form | 25 |
| One-billionth of a gig | 22 |
| One-armed bandit, briefly | 25 |
| One-armed bandit's gullet | 29 |
| One-armed bandit's arm | 26 |
| One-armed bandit picture | 24 |
| One-armed bandit feature | 24 |
| One-act play by O'Neill | 27 |
| One-act Oscar Wilde play | 24 |
| One-act opera by Puccini | 24 |
| One- _____ (short play) | 23 |
| One- to ten-yr. investments | 27 |
| One, with "a" | 23 |
| One, three or five, e.g. | 24 |
| One, in Saint-Émilion | 25 |
| One, five or ten, e.g. | 22 |
| One, at the Tour de France | 26 |
| One's youthful side | 23 |
| One's wife, slangily | 24 |
| One's wife, informally | 26 |
| One's strong point | 22 |
| One's spiritual being | 25 |
| One's special field | 23 |
| One's significant other | 27 |
| One's sense of wellbeing | 28 |
| One's self, to Serge | 24 |
| One's pledged word | 22 |
| One's performances? | 23 |
| One's performances | 22 |
| One's own: Comb. form | 25 |
| One's own, for a starter | 28 |
| One's own worst critic? | 27 |
| One's own ism, e.g. | 23 |
| One's own creation | 22 |
| One's natural habitat | 25 |
| One's native heath | 22 |
| One's John Henry: Abbr. | 27 |
| One's John Hancock: Abbr. | 29 |
| One's Irish, in a way | 25 |
| One's image, for short | 26 |
| One's home or car, e.g. | 27 |
| One's hands and knees | 25 |
| One's first position? | 25 |
| One's final stand? | 22 |
| One's external world | 24 |
| One's earthly goods | 23 |
| One's contemporary | 22 |
| One's competitive best | 26 |
| One's close acquaintances | 29 |
| One _____ (unlikely chances) | 28 |
| One _____ (form of baseball) | 28 |
| One ____: kid's ball game | 29 |
| One ___ (vitamin brand) | 23 |
| One ___ (stickball kin) | 23 |
| One ___ (schoolyard game) | 25 |
| One ___ (sandlot game) | 22 |
| One ___ (kids' game) | 24 |
| One ___ (kid's game) | 24 |
| One ___ (kid's ball game) | 29 |
| One ___ (child's game) | 26 |
| One ___ (certain odds) | 22 |
| One ___ (baseball variant) | 26 |
| One __: unlikely chance | 23 |
| One __: kids' ball game | 27 |
| One __ time (individually) | 26 |
| One you can level with | 22 |
| One year's history | 22 |
| One writing poems of praise | 27 |
| One writing on the board | 24 |
| One writing an Op-Ed piece | 26 |
| One writing Alaska stories? | 27 |
| One writing a lot of fiction? | 29 |
| One worthy of imitation | 23 |
| One worthy of emulation | 23 |
| One working with pupils | 23 |
| One working with magnetite | 26 |
| One working with heavy tiles | 28 |
| One working with hammers | 24 |
| One working with feet? | 22 |
| One working with a crook | 24 |
| One working up a lather? | 24 |
| One working the knight shift? | 29 |
| One working out the lumps? | 26 |
| One working on the spot? | 24 |
| One working on the side? | 24 |
| One working on the sheep | 24 |
| One working on some panels | 26 |