Calvin and Hobbes, for one (3)

I think it could be either:

Which length description are you looking for?:

duo

(Other definitions for duo that I've seen before include "Item" , "Two players" , "Brace" , "They might play" , "Performing pair" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.