Additional actor, no star! (5)

I believe the answer is:

extra

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'additional' is the definition.
(extra means additional or surplus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "walk-on part" , "Actor in non-speaking role" , "Minor player in film" , "to boot" , "Accessory" .)

I've seen this clue in The Sun.

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