Redundant actor (5)
I believe the answer is:
extra
I believe this is a double definition.
'redundant' is the first definition.
(synonyms)
'actor' is the second definition.
(extra is a type of actor)
(Other definitions for extra that I've seen before include "Minor actor in crowd scene" , "walk-on part" , "Spare" , "Something additional or bit player in movie" , "no ball perhaps" .)