| Answer | Crossword Clue |
|---|---|
| ONFIRST | "Who's ... ?" (Abbott-Costello routine). |
| WHOSONFIRST | Abbott-Costello routine. |
| WHOSONFIRST | Abbott and Costello routine. |
| WHOS | Part of an Abbott and Costello routine |
| WHOS | Title word of an Abbott and Costello routine |
| WHAT | Second baseman, in an Abbott and Costello comedy routine |
| BASEMEN | Who, What and I Don't Know, in Abbott and Costello's "Who's on First?" routine |
