Ghastly actor, not a movie maker … (8)
I believe the answer is:
director
'movie maker' is the definition.
(I know that director is a type of movie maker)
'ghastly actor not a' is the wordplay.
'ghastly' becomes 'dire'.
'not' is a deletion indicator.
'actor' with 'a' taken away is 'ctor'.
'dire'+'ctor'='DIRECTOR'
(Other definitions for director that I've seen before include "Record it (anag.)" , "Creditor made to create film or play" , "Managing board member" , "Business manager or film maker" , "Senior person in a firm, executive or non-executive" .)