Legendary horseman! (7)
I believe the answer is:
centaur
This clue might be a double definition.
'legendary' is the first definition.
The definition and answer are not the same part of speech. However, I know that 'legendary' relates to this answer.
'horseman' is the second definition.
(half horse, half man)
Can you help me to learn more?
(Other definitions for centaur that I've seen before include "Mythical equine creature" , "Mythical creature with horse's body and man's upper torso" , "Mythical beast, half horse and half man" , "Mythical semi-equine beast" , "Mythical man-horse" .)