Cycled round hot southern island (6)
I believe the answer is:
rhodes
'island' is the definition.
(Greek island)
'cycled round hot southern' is the wordplay.
'cycled' becomes 'rode' (I've seen this in other clues).
'round' indicates putting letters inside.
'hot' becomes 'h'.
'southern' becomes 's' (abbreviation).
'rode' going around 'h' is 'rhode'.
'rhode'+'s'='RHODES'
(Other definitions for rhodes that I've seen before include "British financier and coloniser in southern Africa, d. 1902" , "Shored (anag) - Greek island" , "British imperialist; Greek island" , "Hordes visit the Greek island" , "Greek island - British-born South African statesman" .)