French landscape painter (5)
I believe the answer is:
corot
'french landscape painter' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for corot that I've seen before include "French landscape painter, 1796-1875" , "C19 French landscape painter" , "French artist" , "French landscape painter, d. 1875" , "He painted" .)