Film director a genius to include heartless scene (10)
I believe the answer is:
eisenstein
'film director' is the definition.
(I've seen this before)
'a genius to include heartless scene' is the wordplay.
'a genius' becomes 'einstein' (as in Albert Einstein).
'to include' is an insertion indicator.
'heartless' suggests removing the centre.
'scene' with its middle removed is 'se'.
'einstein' enclosing 'se' is 'EISENSTEIN'.
(Other definitions for eisenstein that I've seen before include "Russian film director" , "Fledermaus tenor, Soviet film-maker" .)