French post-impressionist painter (7)
I believe the answer is:
cezanne
'french post-impressionist painter' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cezanne that I've seen before include "French post-impressionist painter" , "Paul -, Fr. Impressionist" , "The Card Players artist" , "Paul --, French painter" , "French post-impressionist, famous for painting Provence" .)