It may well by sticking (7)

I believe the answer is:

plaster

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'it may well by sticking' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for plaster that I've seen before include "Cover for cut" , "Material applied to walls" , "One to cover wall, wound" , "Smooth covering for walls and ceilings" , "Adhesive material" .)

I've seen this clue in the Evening Standard.

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