Guernica painter (7)
I believe the answer is:
picasso
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">guernica painter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for picasso that I've seen before include "Pablo . . . . . . ., great Spanish artist of 20th century" , "Spanish cubist painter" , "pioneer of Cubism" , "Spanish painter and sculptor" , "Pablo -, artist (Guernica)" .)