Actor surplus to requirements (5)
I believe the answer is:
extra
I believe this clue is a double definition.
'actor' is the first definition.
(extra is a kind of actor)
'surplus to requirements' is the second definition.
(I've seen this before)
(Other definitions for extra that I've seen before include "Not a hit certainly" , "more than is necessary" , "Wide, no-ball, leg bye, etc" , "One playing a minor part" , "No-ball or wide, perhaps?" .)