Handsome young man (6)
I believe the answer is:
adonis
'handsome young man' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for adonis that I've seen before include "A very good-looking ancient Greek" , "Handsome youth loved by Aphrodite" , "Extremely attractive young man from Greek mythology" , "extremely handsome chap" , "A very handsome legendary Greek" .)