Sounds like Greek island ways (5)
I believe the answer is:
roads
'ways' is the definition.
(road is a kind of way)
'sounds like greek island' is the wordplay.
'sounds like' shows a homophone (sound like).
'greek island' becomes 'rhodes' (I've seen this before).
'rhodes' is a homophone of 'ROADS'.
(Other definitions for roads that I've seen before include "Surfaced ways" , "Area by shore where ships lie at anchor; streets" , "Tracks" , "an answer to all clues, initially" , "Highways" .)