Crossword Genius

A horses nay (7)

Ross

I believe the answer is:

refusal

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'nay' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for refusal that I've seen before include "fault in the show ring" , "Dissent" , "Rejection of an offer" , "Chance to decline" , "Possibly first option to buy" .)

I've seen this clue in The Irish News.
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