Greek character hiding in handsome garden (5)
I believe the answer is:
omega
'greek character' is the definition.
(letter from the Greek alphabet)
'hiding in handsome garden' is the wordplay.
'hiding' says the answer is hidden in the clue.
'OMEGA' is hidden within 'in handsome garden'.
(Other definitions for omega that I've seen before include "in Greece, the limit!" , "Consummation" , "Greek finalist" , "16 letter" , "Athenian character" .)