Thin coating (4)
'thin coating' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for film that I've seen before include "Skin" , "Thin coating or covering layer" , "Thin layer (covering a surface)" , "Thin covering or photographic medium (4)" , "Veil; cinema attraction" .)
'thin coating' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for veneer that I've seen before include "Thin layer on surface, often of furniture" , "Thin wooden facing" , "Disguise" , "Decorative surface layer" , "Face" .)