| One under a mattress | 20 |
| One under 20 | 12 |
| One unaffected by Dutch elm disease? | 36 |
| One unable to keep a straight face, perhaps | 43 |
| One unable to get a loan, say | 29 |
| One type of util. | 17 |
| One type of tide | 16 |
| One type of thermometer | 23 |
| One type of talk | 16 |
| One type of sentence | 20 |
| One type of poll | 16 |
| One type of parking | 19 |
| One type of outdoor flooring | 28 |
| One type of message | 19 |
| One type of keyboard ... | 24 |
| One type of insurance | 21 |
| One type is common | 18 |
| One type contains the alphabet | 30 |
| One tying up a turkey, say | 26 |
| One two of two-and-two | 22 |
| One twixt 12 and 20 | 19 |
| One twisted cookie? | 19 |
| One twelfth of a foot | 21 |
| One Twain title character ... | 29 |
| One TV actor, or two authors | 28 |
| One turning to the right | 24 |
| One turning to enter? | 21 |
| One turning color? | 18 |
| One turn of an odometer | 23 |
| One Tuesday | 11 |
| One trying to win a hand? | 25 |
| One trying to stay up while going down | 38 |
| One trying to stay between the lines? | 37 |
| One trying to slim down | 23 |
| One trying to shake a leg, for instance? | 40 |
| One trying to run from home | 27 |
| One trying to make the grade? | 29 |
| One trying to make the grade | 28 |
| One trying to make a living? | 28 |
| One trying to make a big deal of everything | 43 |
| One trying to lose weight | 25 |
| One trying to lose | 18 |
| One trying to keep her seat, maybe | 34 |
| One trying to find the right combination? | 41 |
| One trying to eliminate bad notes | 33 |
| One trying to avoid charges? | 28 |
| One trying to avoid a banking crisis? | 37 |
| One trying not to make a splash | 31 |
| One trying a hiccups cure | 25 |
| One true thing | 14 |
| One troubled with delusions | 27 |
| One tripping over his own feet | 30 |
| One trillionth: Prefix | 22 |
| One trillionth: Comb. form | 26 |
| One trillion, in combinations | 29 |
| One trick --- | 13 |
| One treating swelling, perhaps | 30 |
| One treating disorders of the ear | 33 |
| One treating a boxer | 20 |
| One treating | 12 |
| One traveling often by taxi | 27 |
| One traveling around India with a trunk | 39 |
| One transferring property: Var. | 31 |
| One transferring property rights, in law | 40 |
| One transferring property | 25 |
| One trained in CPR | 18 |
| One trading in futures? | 23 |
| One trading | 11 |
| One tracked by radar | 20 |
| One towards passage | 19 |
| One toward passage | 18 |
| One touch of Venus? | 19 |
| One Touch of Venus collaborator | 34 |
| One touch of Venus | 18 |
| One tossed into a fountain | 26 |
| One topping for a Domino's dessert pizza | 44 |
| One tooting a horn | 18 |
| One too shrewd to be tricked | 28 |
| One Tolkien middle "R." | 33 |
| One told to hang on, in song | 28 |
| One toasted or roasted | 22 |
| One to whom you might say, "I doubt that" | 51 |
| One to whom the Ganges is sacred | 32 |
| One to whom dice are passed | 27 |
| One to whom a warranty applies | 30 |
| One to whom "Ahoy!" is directed | 41 |
| One to watch out for | 20 |
| One to watch in a pinch? | 24 |
| One to walk with | 16 |
| One to toast at a roast | 23 |
| One to throw a ball for | 23 |
| One to the left on the Hill | 27 |
| One to ten, sometimes | 21 |
| One to ten, say | 15 |
| One to tell it to | 17 |
| One to take a complaint to: Abbr. | 33 |
| One to start? | 13 |
| One to speak of? | 16 |
| One to Sergio | 13 |
| One to rub out? | 15 |