… an artist concerned with film genre (6)
I believe the answer is:
renoir
'an artist' is the definition.
(I've seen this before)
'concerned with film genre' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'film genre' becomes 'noir' (I've seen this in another clue).
're'+'noir'='RENOIR'
(Other definitions for renoir that I've seen before include "Pierre-Auguste -, French Impressionist painter" , "French artist" , "No, I err about the great painter" , "Pierre ---, impressionist" , "film maker" .)