Skin-deep beauty (6)

I believe the answer is:

veneer

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'skin' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for veneer that I've seen before include "screen" , "Outward respectability" , "Thin superficial layer" , "Thin wooden surface" , "Thin layer of a fine material on the surface" .)

I've seen this clue in the Evening Standard.

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