Crossword Genius

Gear to make use of horsepower (7)

Ross

I believe the answer is:

harness

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(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 Irish News and The Globe and Mail.
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