In plays, the cast can vary (4)

I believe the answer is:

acts

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'in plays' is the definition.
'acts' can be an answer for 'plays' ('act' can be a synonym of 'play'). I'm not sure about the 'in' bit.

'cast can vary' is the wordplay.
'cast' anagrams to 'ACTS'.
But, I am unsure how this is indicated.

'the' acts as a link.

Can you help me to learn more?

(Other definitions for acts that I've seen before include "performers for revue, say?" , "[BOOK] of the 26 [BIBLE]" , "Parliaments pass them" , "bands, comedians, etc" , "Deeds; NT book" .)

I've seen this clue in the Evening Standard.

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