Crossword Genius

Informer or spy (4)

Ross

I believe the answer is:

nark

I believe this is a double definition.

'informer' is the first definition.
(I know that nark is a type of informer)

'spy' is the second definition.
(I've seen this before)

(Other definitions for nark that I've seen before include "Informer - irritate" , "Get to" , "Police spy" , "expert" , "Keep an eye" .)

I've seen this clue in The Mirror.
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