Acts of revolution? (5)

I believe the answer is:

turns

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'acts of' is the definition.
'turns' can be an answer for 'acts'. I'm unsure of the 'of' bit.

I can't explain the remainder of the clue.

(Other definitions for turns that I've seen before include "Rotations" , "Rotates" , "Bends" , "Changes direction" , "Moves in a new direction" .)

I've seen this clue in the Evening Standard.

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