Actor not acknowledged when producing more (5)
I believe the answer is:
extra
'more' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for extra that I've seen before include "Auxiliary" , "No great contribution to film" , "Bonus; supplement" , "Small part actor" , "Ancillary" .)