Crossword Genius

One of four on a horse, say (4)

Ross

I believe the answer is:

hoof

(Other definitions for hoof that I've seen before include "Ungulate's foot" , "Part of horse's foot" , "Horny cover of foot" , "Part of animal's foot" , "Horse's horny foot casing" .)

I've seen this clue in The Guardian.
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