Thin layer of wood (6)
I believe the answer is:
veneer
'thin layer of wood' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for veneer that I've seen before include "Thin covering of expensive wood on furniture" , "Thin coating on a surface" , "Thin wood facade" , "Thin top layer of decorative wood" , "'e never (anag.)" .)