Mythical horseman? (7)
I believe the answer is:
centaur
'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" .)