Snoops, possibly during lessons (5)

I believe the answer is:

noses

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'snoops' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for noses that I've seen before include "Snouts" , "Beaks, conks" , "Facial features" , "Schnozzles" , "Olfactory organs" .)

I've seen this clue in the Evening Standard.

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