Cast, surprisingly, does what it does? (4)

I believe the answer is:

acts

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'does?' is the definition.
(I've seen this before)

'cast surprisingly does what it' is the wordplay.
'cast' can be anagrammed to 'ACTS'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for acts that I've seen before include "performers for revue, say?" , "Cast in exploits" , "Takes steps" , "functions" , "[BOOK] of the 26 [BIBLE]" .)

I've seen this clue in The Telegraph.

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