Artist Chagall (4)
I believe the answer is:
marc
'artist chagall' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for marc that I've seen before include "Type of eau-de-vie made from residue of grapes" , "Spirit" , "Brandy distilled from grape residue" , "Chagall for one" , "Cram (anag.)" .)