Crossword Genius

Goes on at horses (4)

Ross

I believe the answer is:

nags

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'horses' is the definition.
(I know this)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nags that I've seen before include "Constantly finds fault" , "Pesters" , "Constantly reproaches and complains" , "Scolds - horses" , "Worries; horses" .)

I've seen this clue in The Mirror.
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