Large Greek island (5)
I believe the answer is:
crete
'large greek island' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for crete that I've seen before include "Mediterranean island, capital Heraklion" , "Greek island, site of the Minoan civilisation" , "Island whose largest city is Heraklion" , "European location" , "Greek island, capital Heraklion" .)