Comely youth in farmstead on island (6)
I believe the answer is:
adonis
'comely youth' is the definition.
'in farmstead on island' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ADONIS' is hidden in the letters of 'farmstead on island'.
(Other definitions for adonis that I've seen before include "ideal man" , "male looker" , "dandy" , "Fit bloke" , "Said no to the Greek youth" .)