Part of a horse's 3D (7)

I believe the answer is:

fetlock

(Other definitions for fetlock that I've seen before include "Part of horse's leg above and behind hoof" , "Joint just above a horse's hoof -- to fleck (anag)" , "Projection above a horse's hoof" , "Equine leg joint" , "Horse's leg joint" .)

I've seen this clue in The Times.

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