Man-horse? (7)
I believe the answer is:
centaur
'man-horse?' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for centaur that I've seen before include "Half-man and half horse" , "Mythical semi-equine beast" , "beast seemingly half human" , "Mythical creature with horse's body and man's upper torso" , "Mythical animal, half man and half horse" .)