The horse, when wild, detested all but Ted (5)

I believe the answer is:

steed

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

I don't understand how the rest of the clue works.

(Other definitions for steed that I've seen before include "Spirited horse" , "A mount (poet.)" , "Swift horse" , "Trusty horse" , "Powerful horse" .)

I've seen this clue in the Evening Standard.

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