Crossword Genius

"Are you kidding?" (4)

Ross

I believe the answer is:

what

'are you kidding?' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for what that I've seen before include "I didn't hear" , "I beg your pardon" , "Interrogatory word" , "Eh?" , "That which - come again!" .)

I've seen this clue in the Universal and the USA Today.
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.