Tackle with difficulty, crossword finally dispatched (7)

I believe the answer is:

harness

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'tackle' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for harness that I've seen before include "Arrangement of straps for a horse" , "Control - some tack" , "Horse's tackle" , "Couple" , "Control and use (resources)" .)

I've seen this clue in The Times.

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