Wizard seen to bolt after fighting (7)
I believe the answer is:
warlock
'wizard' is the definition.
(thesaurus)
'to bolt after fighting' is the wordplay.
'to bolt' becomes 'lock' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'fighting' becomes 'war' (**).
'lock' after 'war' is 'WARLOCK'.
'seen' acts as a link.
(Other definitions for warlock that I've seen before include "Male magician - British composer, 1894-1930 - low rack (anag)" , "Charmer" , "Wizard, magician" , "Cork law about male witch" , "Magician; Peter ---, composer" .)