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Yet this horse keeps going (6)

Ross

I believe the answer is:

stayer

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'yet this horse keeps going' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's a link between them I don't understand?

This is the entire clue.

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(Other definitions for stayer that I've seen before include "being in for the long run" , "One likely to carry on" , "marathon man" , "Long-distance runner, rather than sprinter" , "Persistent person" .)

I've seen this clue in The Globe and Mail.
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