Crossword Genius

Deal breaker? (4)

Ross

I believe the answer is:

narc

'deal breaker?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for narc that I've seen before include "One on drugs squad" , "Agent dealing with Charlie" , "Drugs agent (US)" , "Drugs officer" , "member of drug squad" .)

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