One of the Ionian Islands (5)
I believe the answer is:
corfu
'one of the ionian islands' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for corfu that I've seen before include "Ionian holiday island" , "Greek island, a British protectorate in C 19" , "One of the Ionian islands" , "Greeks here?" , "Major holiday island off west coast of Greece" .)