Quiet girl taking in a film (6)
I believe the answer is:
patina
'film' is the definition.
(thesaurus)
'quiet girl taking in a' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'girl' becomes 'tina' (**).
'taking in' is an insertion indicator.
'p'+'tina'='ptina'
'ptina' enclosing 'a' is 'PATINA'.
(Other definitions for patina that I've seen before include "Surface film on ancient bronze" , "Fine layer on surface (from oxidisation or handling)" , "Surface shine" , "well-worn surface" , "Sheen acquired from constant handling" .)