The range of Chagall (3)
I believe the answer is:
aga
'the range' is the definition.
(I've seen this before)
'of chagall' is the wordplay.
'of' indicates a hidden word.
'AGA' is hidden within 'chagall'.
(Other definitions for aga that I've seen before include "Turkish leader" , "--- Khan, title of the head of the Ismaili Muslims" , "Heavy metal stove" , "Type of stove" , "... Khan is a spiritual Muslim leader" .)