One busting a pusher (4)

I believe the answer is:

narc

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

I've seen this clue in the Universal.

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.