Crossword Genius

Actor not acknowledged when producing more (5)

Ross

I believe the answer is:

extra

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'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" .)

I've seen this clue in The Irish Times.
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