Crossword Genius

Nonfunctioning firecracker (3)

Ross

I believe the answer is:

dud

(Other definitions for dud that I've seen before include "'Flop, turkey (3)'" , "Counterfeit article" , "Firework not going up" , "Not working" , "Bullet that fails to fire" .)

I've seen this clue in the Newsday.
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