Conservative insolence in film sample (4)
I believe the answer is:
clip
'film sample' is the definition.
(I've seen this in another clue)
'conservative insolence' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'insolence' becomes 'lip' (I've seen this in another clue).
'c'+'lip'='CLIP'
'in' acts as a link.
(Other definitions for clip that I've seen before include "Prune" , "Something that holds things together - cut" , "Shorten" , "One holding together < trim" , "Device for holding papers together" .)