Snitch (on)

I think it could be either:

Which length description are you looking for?:

narc

'snitch on' is the definition.
(thesaurus)

This is all the clue.

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

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

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