| One-dimensional | 15 |
| One-day replacement, often | 26 |
| One-day "Jeopardy!" contestant, e.g. | 46 |
| One-customer link | 17 |
| One-customer connector | 22 |
| One-customer connection | 23 |
| One-crop nations | 16 |
| One-consonant instrument | 24 |
| One-chevron G.I.'s | 22 |
| One-chevron G.I. | 16 |
| One-chapter O.T. book | 21 |
| One-cent Tiffany issue of 2003? | 31 |
| One-cent coin | 13 |
| One-cellers | 11 |
| One-celler | 10 |
| One-celled swimmer | 18 |
| One-celled protozoans | 21 |
| One-celled protozoan (Var.) | 27 |
| One-celled protozoan | 20 |
| One-celled protozoa (Var.) | 26 |
| One-celled protozoa | 19 |
| One-celled pond dwellers | 24 |
| One-celled organisms | 20 |
| One-celled organism (Var.) | 26 |
| One-celled organism | 19 |
| One-celled microorganisms | 25 |
| One-celled critter | 18 |
| One-celled creatures (var.) | 27 |
| One-celled creatures | 20 |
| One-celled creature | 19 |
| One-celled body | 15 |
| One-celled blob | 15 |
| One-celled being | 16 |
| One-celled animals | 18 |
| One-celled animal | 17 |
| One-celled alga | 15 |
| One-cell creatures | 18 |
| One-by-one formation, as in walking | 35 |
| One-billionth: Prefix | 21 |
| One-billionth: Comb. form | 25 |
| One-billionth of a gig | 22 |
| One-band set | 12 |
| One-band appliances | 19 |
| One-armed ___ | 13 |
| One-armed pitcher? | 18 |
| One-armed bandits? | 18 |
| One-armed bandits | 17 |
| One-armed bandit, briefly | 25 |
| One-armed bandit's gullet | 29 |
| One-armed bandit's arm | 26 |
| One-armed bandit's "mouth" | 40 |
| One-armed bandit picture | 24 |
| One-armed bandit feature | 24 |
| One-armed bandit | 16 |
| One-and-only | 12 |
| One-and-a-half turns in the air | 31 |
| One-acter | 9 |
| One-act Strauss opera | 21 |
| One-act Sartre play | 19 |
| One-act play by O'Neill | 27 |
| One-act play | 12 |
| One-act Oscar Wilde play | 24 |
| One-act opera by Puccini | 24 |
| One-act opera by Camille Saint-Saens | 36 |
| One-a-Day ingredient | 20 |
| One- _____ (short play) | 23 |
| One- ____ | 9 |
| One- to ten-yr. investments | 27 |
| One- liner | 10 |
| One- -- (short shows) | 21 |
| One- -- (short plays) | 21 |
| One- -- (short films) | 21 |
| One- -- (short drama) | 21 |
| One- -- (biased) | 16 |
| One, with "a" | 23 |
| One, two, or three | 18 |
| One, two and three ... or this puzzle's title | 49 |
| One, to Wilhelm | 15 |
| One, to Wagner | 14 |
| One, to some | 12 |
| One, to Ouida | 13 |
| One, to Otto | 12 |
| One, to Oppenheimer | 19 |
| One, to one, e.g. | 17 |
| One, to Marie | 13 |
| One, to Juanita | 15 |
| One, to Juana | 13 |
| One, to Juan | 12 |
| One, to Jacques | 15 |
| One, to Helmut | 14 |
| One, to Hans | 12 |
| One, to Fritz (3) | 17 |
| One, to Fritz | 13 |
| One, to Burns | 13 |
| One, to Beethoven | 17 |
| One, to Antoine | 15 |
| One, to Angus | 13 |
| One, to a Scot | 14 |
| One, three or five, e.g. | 24 |
| One, somewhere | 14 |