Subdivision of a play (3)

I think it could be either:

Which length description are you looking for?:

act

'subdivision of a play' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for act that I've seen before include "Subdivision of a play" , "Perform theatrically" , "Exploit" , "Routine" , "Ordinance" .)

I've seen this clue in The Times and the USA Today.

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