A nosy informer (5)

I believe the answer is:

snout

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'informer' is the definition.
(snout can mean a police informant)

I can't explain the rest of the clue.

(Other definitions for snout that I've seen before include "Projecting nasal area of animal" , "nose of pig" , "Tobacco -- hooter" , "Nose and mouth of a mammal" , "Animal's muzzle" .)

I've seen this clue in the Evening Standard.

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