Cubist painter (7)
I believe the answer is:
picasso
'cubist painter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for picasso that I've seen before include "Pablo ,,,,,,,, great late Spanish artist" , "Pablo, great Spanish painter" , "Pablo . . . . . . ., extraordinary 20th century artist" , "Spanish cubist painter" , "Spanish artist, 1881-1973" .)