Bonuses for actors in crowd scenes (6)
I believe the answer is:
extras
I believe this is a double definition.
'bonuses' is the first definition.
(I've seen this in another clue)
'actors in crowd scenes' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for extras that I've seen before include "They're additional on a film set" , "Minor film actors" , "Bit actors in film" , "Crowd scene actors" , "Bit players, actors without dialogue" .)