Crossword Genius

"Is this a ___?" ("I can't tell if you're joking") (3)

Ross

I believe the answer is:

bit

(Other definitions for bit that I've seen before include "something boring" , "The boring-piece of a drill" , "Small fragment" , "which is between one's teeth?" , "Sank teeth in" .)

I've seen this clue in the USA Today.
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