Understudy got his chances? (5)

I believe the answer is:

acted

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'got his chances?' is the definition.
The answer and definition can be both related to bodily activities as well as being past participle verbs.
Maybe you can see an association between them that I can't see?

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

Can you help me to learn more?

(Other definitions for acted that I've seen before include "Performed on stage" , "Behaved in a certain manner" , "Behaved or performed" , "Behaved or played a part" , "produced an effect" .)

I've seen this clue in The Irish News.

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