Crossword Genius

Worn-out mount (3)

Ross

I believe the answer is:

nag

(Other definitions for nag that I've seen before include "Bother persistently" , "Old or over-worked horse" , "Scold persistently, annoy" , "Annoy the old horse persistently" , "Old Arab maybe" .)

I've seen this clue in The Wall Street Journal.
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