Flemish painter (6)
I believe the answer is:
rubens
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flemish 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 rubens that I've seen before include "Peter Paul -, sixteenth-seventeenth century Flemish painter" , "Flemish painter, 1577-1640" , "Peter Paul --, artist" , "Flemish baroque artist" , "Sir Peter Paul ---, painter" .)