Glossy coat (7)

I believe the answer is:

varnish

'glossy coat' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for varnish that I've seen before include "Protective coating" , "Hard finishing coating" , "Nail polish" , "Hard glossy transparent paint" , "Glossy stain" .)

I've seen this clue in The Times, The Telegraph and The Sunday Times.

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