Goat leaving grain comes to island (5)
I believe the answer is:
capri
'to island' is the definition.
(Italian island)
'goat leaving grain' is the wordplay.
'goat' becomes 'Capricorn' (the goat in the zodiac).
'leaving' suggests deleting specific letters.
'grain' becomes 'corn' (corn is a kind of grain).
'capricorn' with 'corn' taken away is 'CAPRI'.
'comes' acts as a link.
(Other definitions for capri that I've seen before include "Island off Italy" , "Old Ford model - Italian island" , "I carp about the island" , "Italian resort island, once home to Gracie Fields" , "Island home of G. 24" .)