Chagall study recalled (4)
I believe the answer is:
marc
'chagall' is the definition.
(I've seen this in another clue)
'study recalled' is the wordplay.
'study' becomes 'cram' (cramming is a kind of studying).
'recalled' says the letters should be written backwards.
'cram' backwards is 'MARC'.
(Other definitions for marc that I've seen before include "Chagall for one" , "Grape refuse" , "Sort of brandy made from the remains of pressed grapes" , "A brandy; --- Chagall, artist" , "Brandy made from wine press residue" .)