| FRIEDA | Character in the comic strip Peanuts by Charles Schulz who was the only girl without a cap on Charli |
| SNOOPY | Charlie Brown's pet beagle in the comic strip Peanuts by Charles M. Schulz (6) |
| CHARLIEBROWN | Protagonist in the comic strip Peanuts by Charles M Schulz |
| TOPLESS | Without a cap on ... or a lot else? |
| WENTFLAT | Stayed out without a cap on? |
| MATTER | "If you were the only girl in the world, and I were the only boy; Nothing else would ... in the world today; We could go on loving in the same old way" |
| BELLE | Sister of Snoopy in the comic strip Peanuts by US cartoonist Charles Schulz (5) |
| AYER | Who wrote the songs Oh, You Beautiful Doll" (1911) and If You Were the Only Girl in the World (1916)? (4) |
| OBRIEN | Double-bassist Orin ___ (subject of "The Only Girl in the Orchestra," which won the Oscar for Best Documentary Short Film in March, 2025) |
| LINUS | This pope shares a name with a character in the comic strip Peanuts. |
| TOADSTOOL | The spore-bearing body of a fungus, in the form of a cap on a stalk (9) |
| SALEM | Cat who lives with the title character in the comic series Sabrina the Teenage Witch (5) |
| BROWN | Character in the comic strip Peanuts, Charlie ... |
| BEG | To humbly entreat, whether a mendicant monk, a pauper with a cap on the street or a hopeful spaniel sitting up for a treat (3) |
| ORIN | Double bassist O'Brien, subject of "The Only Girl in the Orchestra" |
| VERA | The only girl in the whole nation (4) |
| KORKY | ___ the Cat, character in the comic The Dandy (5) |
| ROTBLAT | Sir Joseph ___, Nobel Peace Prize-winner who was the only physicist to leave the Manhattan Project on grounds of conscience |
| IDA | Lupino who was the only woman to direct an episode of the 1959 The Twilight Zone series |
| WOODSTOCK | Bird in the comic strip Peanuts whose chirping is represented in print as hash marks |
