Crossword Genius

Equine refusal? (5)

Ross

I believe the answer is:

neigh

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'equine refusal?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is the entire clue.

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(Other definitions for neigh that I've seen before include "Comment from stallion" , "Farmyard sound" , "one made by Bucephalus?" , "Horse's noise" , "Mare's cry, e.g." .)

I've seen this clue in the Evening Standard.
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