We back away from Notts town informer (4)

I believe the answer is:

nark

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'informer' is the definition.
(nark is a kind of informer)

I don't understand the remainder of the clue.

(Other definitions for nark that I've seen before include "Cooper's .... was old police informer" , "Stool pigeon" , "Bother" , "Habitual grumbler" , "Annoy; police informer" .)

I've seen this clue in The Times.

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