Mythical horse-man (7)
I believe the answer is:
centaur
'mythical horse-man' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for centaur that I've seen before include "Mythical equine creature" , "Horsey person" , "Mythic man-horse" , "Half-man and half horse" , "Mythical semi-equine beast" .)