South Pacific republic (4)
I believe the answer is:
fiji
'south pacific republic' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fiji that I've seen before include "Country of many islands" , "South Pacific country of some 840 islands" , "South Pacific country, capital Suva" , "Pacific island country" , "Pacific island state" .)