Gear to make use of horsepower (7)

I believe the answer is:

harness

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'gear' is the definition.
(I know that harness is a type of saddlery)

I can't explain the remainder of the clue.

(Other definitions for harness that I've seen before include "Control; trappings" , "Control - some tack" , "Straps fitted to a horse" , "Equipment for the horse" , "Arrangement of straps for a horse" .)

I've seen this clue in The Globe and Mail and The Irish News.

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