Crossword Genius

Horse to detest running, losing time (5)

Ross

I believe the answer is:

steed

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'horse' is the definition.
(steed is a kind of horse)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for steed that I've seen before include "Literary term for horse" , "Horse, mount" , "Powerful horse" , "Trusty horse" , "(Poetic) horse" .)

I've seen this clue in The Mirror.
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