Implement gyration of booty (4)

I believe the answer is:

tool

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'implement' is the definition.
(tool is a kind of implement)

I don't understand the remainder of the clue.

(Other definitions for tool that I've seen before include "Maybe saw" , "Working instrument" , "For example, saw" , "Utensil; implement" , "Appliance" .)

I've seen this clue in The Independent.

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