Crossword Genius

Mythical horseman? (7)

Ross

I believe the answer is:

centaur

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

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

Can you help me to learn more?

(Other definitions for centaur that I've seen before include "Mythical hybrid" , "Half-man and half horse" , "Mythological horse-man" , "Horsey person" , "Greek mythical creature" .)

I've seen this clue in The Telegraph and The Sun.
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