| Writer in cipher, maybe | 23 |
| Work under cover, in a way | 26 |
| Word repeated in Mad magazine's "___ vs. ___" | 59 |
| Word before and after "vs." in a Mad feature | 54 |
| Wiretapper, maybe | 17 |
| What's a Mata? | 18 |
| What was Caleb in the Bible? | 28 |
| Watch undercover | 16 |
| Watch stealthily | 16 |
| Washington D.C.'s International ___ Museum | 46 |
| Valerie Plame, e.g. | 19 |
| Use a tap, perhaps | 18 |
| Use a periscope | 15 |
| Use a peephole, say | 19 |
| Unwelcome plant | 15 |
| Unwanted plant? | 15 |
| U-2 pilot, e.g. | 15 |
| Try to improve one's intelligence illegally, perhaps | 56 |
| Triple agent | 12 |
| Thriller hero, often | 20 |
| Stratego piece with a monocle | 29 |
| Stratego piece (3) | 18 |
| Snoop (on) | 10 |
| Smiley was one | 14 |
| Smart, for one | 14 |
| Smart job | 9 |
| Shadow, maybe | 13 |
| Seek intelligence | 17 |
| Secrets stealer | 15 |
| Secretly watch, with "on" | 35 |
| Secret trader | 13 |
| Secret collector | 16 |
| Search for intelligence | 23 |
| Saskatchewan's ____ Hill | 28 |
| Rudolf Abel, e.g. | 17 |
| Powers, e.g. | 12 |
| Powers up on the big screen, e.g. | 33 |
| Plotted plant? | 14 |
| Plant or mole | 13 |
| Plant of a sort | 15 |
| Plant gathering information | 27 |
| Person with intelligence | 24 |
| Peek through a keyhole | 22 |
| Peek in (on) | 12 |
| Passer of secret documents | 26 |
| Only Stratego piece with a letter on it | 39 |
| Only Stratego piece that can take a marshal | 43 |
| One with numerous passports | 27 |
| One with a hidden camera pen | 28 |
| One with a code name, perhaps | 29 |
| One with a code name | 20 |
| One who might be recruited | 26 |
| One who bugs people? | 20 |
| One who "came in from the cold" | 41 |
| One wearing a wire, perhaps | 27 |
| One undercover | 14 |
| One seeking intelligence | 24 |
| One of two regular Mad magazine opponents | 41 |
| One might need a cover | 22 |
| One may bug you | 15 |
| Office plant, at times? | 23 |
| Northern, for one | 17 |
| Northern ___ (apple type) | 25 |
| Northern ___ | 12 |
| Nathan Hale, notably | 20 |
| Napoleon Solo, for one | 22 |
| Mole or shadow, perhaps | 23 |
| Mole or plant | 13 |
| Moe Berg for one | 17 |
| MI6 trainee | 11 |
| MI6 member | 10 |
| Mata Hari, notably | 18 |
| Mata Hari | 9 |
| Many a character in TV's "The Americans" | 54 |
| Many a bugger | 13 |
| Man of intelligence | 19 |
| Mail-drop user | 14 |
| Mad antagonist | 14 |
| Look through a peephole, perhaps | 32 |
| Look in (on) | 12 |
| Lettered Stratego piece | 23 |
| Leader of a double life | 23 |
| Le Carré staple | 18 |
| Le Carré hero, e.g. | 22 |
| Le Carre creation | 17 |
| Le Carre character, or Saskatchewan hill | 40 |
| Klaus Fuchs, e.g. | 17 |
| Kind of ring or glass | 21 |
| Kind of catcher | 15 |
| KGB worker | 10 |
| Keep watch secretly | 19 |
| K.G.B. man | 10 |
| J. F. Cooper character | 22 |
| Invisible ink user | 18 |
| Intelligencer | 13 |
| Intel employee? | 15 |
| I ____ : '60s TV fare | 27 |
| Hush-hush job | 13 |
| He "came in from the cold" | 36 |
| Hari, for one | 13 |