Artist, name inspiring witch (7)
I believe the answer is:
chagall
'artist' is the definition.
(painter Marc Chagall)
'name inspiring witch' is the wordplay.
'name' becomes 'call' (to call them someone something is to name them).
'inspiring' is an insertion indicator.
'witch' becomes 'hag' (synonyms).
'call' enclosing 'hag' is 'CHAGALL'.
(Other definitions for chagall that I've seen before include "Russian-born painter" , "Marc -, twentieth century Russian-born French artist" , "Marc --, Russian-French artist" , "He painted" , "Marc --, Russian artist" .)