Thin surface layer of fine material (6)

I believe the answer is:

veneer

(Other definitions for veneer that I've seen before include "Specious outward appearance of good quality" , "Fine overlay or superficial refinement" , "Face" , "Thin layer of a fine material on the surface" , "Thin covering on top, as of wood" .)

I've seen this clue in The Irish Times.

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