Hordes go out to the Greek island (6)
I believe the answer is:
rhodes
'hordes go out to the greek island' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rhodes that I've seen before include "Cycled round hot Society Island" , "British imperialist; Greek island" , "Island, explorer" , "Dock for undersea craft" , "Greek port" .)