A fabulous horseman (7)

I believe the answer is:

centaur

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'horseman' is the definition.
(half horse, half man)

I can't explain the remainder of the clue.

(Other definitions for centaur that I've seen before include "Greek mythical creature" , "Mythical semi-equine beast" , "Mythic man-horse" , "Mythical creature, half-man, half-horse" , "Mythical beast, half horse and half man" .)

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

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