Crossword Genius

Police informer, colloquially (4)

Ross

I believe the answer is:

nark

(Other definitions for nark that I've seen before include "Cause minor annoyance" , "Annoy (colloq.); informer" , "source of irritation" , "Habitual grumbler" , "Stool pigeon" .)

I've seen this clue in The Irish Times.
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