Crossword Genius

Of a horse, a shoe? (7)

Ross

I believe the answer is:

trainer

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'a shoe?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for trainer that I've seen before include "Running shoe" , "one might put one's foot in it" , "Coach; shoe" , "Plimsoll or sneaker" , "Terrain (anag.)" .)

I've seen this clue in the Evening Standard.
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