Silent actor's bonus (5)
I believe the answer is:
extra
This might be a double definition.
'silent actor's' is the first definition.
'extra' can be an answer for 'actor's' (extra is a type of actor). I'm unsure of the 'silent' bit.
'bonus' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for extra that I've seen before include "comes to 16 [TEST MATCH]" , "outside" , "Not a standard item" , "lesser player" , "particularly" .)