Chagall or Bolan? (4)
I believe the answer is:
marc
'chagall or bolan?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for marc that I've seen before include "A brandy; --- Chagall, artist" , "Grape refuse" , "Type of eau-de-vie made from residue of grapes" , "Refuse from grapes after pressing - kind of brandy" , "Chagall for one" .)