Red painter (6)
I believe the answer is:
titian
I believe this clue is a double definition.
'red' is the first definition.
(thesaurus)
'painter' is the second definition.
(Titian is an example)
(Other definitions for titian that I've seen before include "It. painter, famous for redheads" , "Venetian painter - shade of red" , "Italian artist" , "Italian painter; hair colour" , "Colour named after artist" .)