Thin covering (4)
'thin covering' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for veneer that I've seen before include "Mask; gloss" , "Thin covering on top, as of wood" , "Misleading external appearance" , "Thin layer of fine wood covering surface of cheaper wood" , "Attractive surface appearance" .)
'thin covering' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for film that I've seen before include "Flick" , "Thin layer (covering a surface)" , "Thin coating for movie." , "Thin coating or covering layer" , "An entertainment; thin layer" .)