Actor's character (4)
I believe the answer is:
role
'actor's character' is the definition.
'role' can be an answer for 'character' (synonyms). I also know that 'actor' relates to this answer.
This is the entire clue.
(Other definitions for role that I've seen before include "Duty" , "Playing part" , "Part played (in life?)" , "Actor's part" , "A part of lore" .)