| Part of an O'Neill title | 28 |
| Part of an O. Henry title | 25 |
| Part of an Oahu welcome | 23 |
| Part of an octet | 16 |
| Part of an octopus | 18 |
| Part of an ode | 14 |
| Part of an office phone no. | 27 |
| Part of an office sched. | 24 |
| Part of an officer's uniform | 32 |
| Part of an oil lamp | 19 |
| Part of an old block? | 21 |
| Part of an old boast | 20 |
| Part of an old comedy trio, with his brothers Harry and Jimmy | 61 |
| Part of an old English Christmas feast | 38 |
| Part of an old Greek fleet | 26 |
| Part of an old Greek stage | 26 |
| Part of an old heating system | 29 |
| Part of an old inscription | 26 |
| Part of an old military alphabet | 32 |
| Part of an old phone | 20 |
| Part of an old punchline | 24 |
| Part of an old Royal Navy ration | 32 |
| Part of an old sock, maybe | 26 |
| Part of an old telephone | 24 |
| Part of an old toy telephone | 28 |
| Part of an old TV | 17 |
| Part of an old TV catchphrase, also used by Ed McMahon | 54 |
| Part of an old United Nations name | 34 |
| Part of an old-fashioned pin-up | 31 |
| Part of an old-fashioned pinup | 30 |
| Part of an Olympics chant | 25 |
| Part of an open fireplace, often | 32 |
| Part of an opera | 16 |
| Part of an opera house | 22 |
| Part of an operatic name | 24 |
| Part of an orange | 17 |
| Part of an oratorio | 19 |
| Part of an orch. | 16 |
| Part of an orchestra | 20 |
| Part of an order | 16 |
| Part of an org. | 15 |
| Part of an organ | 16 |
| Part of an oriel | 16 |
| Part of an Orkan greeting | 25 |
| Part of an Otis Redding hit | 27 |
| Part of an ounce | 16 |
| Part of an outfit | 17 |
| Part of an overcoat | 19 |
| Part of an ownership team | 25 |
| Part of an S.A.T. | 17 |
| Part of an ultimatum | 20 |
| Part of an umpire's count | 29 |
| Part of an umpire's uniform | 31 |
| Part of an Uncle Sam costume | 28 |
| Part of an underground network | 30 |
| Part of an underground network? | 31 |
| Part of an underground spring crop | 34 |
| Part of an upscale eatery name | 30 |
| Part of an X-ray machine | 24 |
| Part of an Xmas rocket, perhaps | 31 |
| Part of ANC | 11 |
| Part of ANC (abbr.) | 19 |
| Part of ancient Asia Minor | 26 |
| Part of ancient Athens | 22 |
| Part of ancient Greece | 22 |
| Part of ancient Greece with the city Megalópolis | 51 |
| Part of ancient history | 23 |
| Part of ancient Phoenicia, today | 32 |
| Part of ancient Turkey | 22 |
| Part of Antiquity | 17 |
| Part of any good crossword puzzle | 33 |
| Part of any profit calculation | 30 |
| Part of any URL address | 23 |
| Part of any Verdi composition | 29 |
| Part of AOL | 11 |
| Part of APB | 11 |
| Part of APEC | 12 |
| Part of APR | 11 |
| Part of Aquinas's credo | 27 |
| Part of Arabia | 14 |
| Part of Argentina's capital | 31 |
| Part of Armstrong's statement | 33 |
| Part of Arnie's arsenal | 27 |
| Part of ARU | 11 |
| Part of ASAP | 12 |
| Part of ASCAP | 13 |
| Part of Ascap: Abbr. | 20 |
| Part of Asia Minor | 18 |
| Part of ASL | 11 |
| Part of ASPCA | 13 |
| Part of aspirin | 15 |
| Part of assembly instructions | 29 |
| Part of AST | 11 |
| Part of AST: Abbr. | 18 |
| Part of AT&T | 16 |
| Part of AT&T, once | 22 |
| Part of AT&T: Abbr. | 23 |
| Part of ATM | 11 |
| Part of Attila's legion | 27 |
| Part of ATV | 11 |