Matt never mentions such paint! (5)

I believe the answer is:

gloss

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'paint' is the definition.
(I have seen 'Shiny paint ' mean 'gloss' so perhaps 'paint' could also mean 'gloss')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for gloss that I've seen before include "Surface shine" , "Sheen - paint" , "Misleading explanation" , "Superficial appearance" , "Show" .)

I've seen this clue in the Evening Standard.

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