Film barrister in French bar (5,9)
I believe the answer is:
brief encounter
'film' is the definition.
(I've seen this before)
'barrister in french bar' is the wordplay.
'barrister' becomes 'brief' (I've seen this before).
'in french' becomes 'en' ('en' can be French for 'in' e.g. en France).
'bar' becomes 'counter' (I've seen this before).
'brief'+'en'+'counter'='BRIEF ENCOUNTER'
(Other definitions for brief encounter that I've seen before include "Film set largely at a railway station" , "Picture" .)