Skin flick (4)
I believe the answer is:
film
This clue is a double definition.
'skin' is the first definition.
(thesaurus)
'flick' is the second definition.
('film' can be a synonym of 'flick')
(Other definitions for film that I've seen before include "Thin layer (covering a surface)" , "Thin covering or photographic medium (4)" , "Skin" , "Motion picture" , "Moving picture" .)