Island routes, so we hear (6)
I believe the answer is:
rhodes
'island' is the definition.
(Greek island)
'routes so we hear' is the wordplay.
'routes' becomes 'roads' (a road is a route or path).
'so we hear' shows a homophone (sound like).
'roads' sounds like 'RHODES'.
(Other definitions for rhodes that I've seen before include "She and Rod have a Greek holiday here" , "Greek island - British-born South African statesman" , "Dock for undersea craft" , "British imperialist; Greek island" , "British financier and coloniser in southern Africa, d. 1902" .)