Handsome youth of Greek mythology (6)
I believe the answer is:
adonis
'handsome youth of greek mythology' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for adonis that I've seen before include "male looker" , "Handsome Greek loved by Aphrodite" , "A very good-looking ancient Greek" , "Archetype of male beauty" , "Handsome youth - said no (anag)" .)