Not sensibly, the horse detested all but Ted (5)

I believe the answer is:

steed

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'ted' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for steed that I've seen before include "Swift horse" , "Warhorse" , "Powerful horse" , "ride" , "Spirited horse" .)

I've seen this clue in the Evening Standard.

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