Crossword Genius

Persistent racehorse (6)

Ross

I believe the answer is:

stayer

(Other definitions for stayer that I've seen before include "Person who lasts the course, doesn't quit" , "One with lasting qualities" , "Long-distance runner, rather than sprinter" , "One likely to carry on" , "one running over a long distance?" .)

I've seen this clue in the Evening Standard.
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