Work during play? (3)

I believe the answer is:

act

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'play?' is the definition.
(I know that play is a more specific form of the action act)

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

Can you help me to learn more?

(Other definitions for act that I've seen before include "Subdivision of a play" , "Perform(ance)" , "Exploit" , "Something done" , "Produce an effect" .)

I've seen this clue in the Evening Standard.

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