Greek island's streets in sound (6)
I believe the answer is:
rhodes
'greek island's' is the definition.
(I've seen this before)
'streets in sound' is the wordplay.
'streets' becomes 'roads' (I've seen this before).
'in sound' indicates a 'sounds like' (homophone) clue.
'roads' is a homophone of 'RHODES'.
(Other definitions for rhodes that I've seen before include "Dock for undersea craft" , "Island, explorer" , "Largest island of the Dodecanese" , "Aegean island" , "Colonial businessman" .)