Persian Gulf nation (5)
I believe the answer is:
qatar
'persian gulf nation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for qatar that I've seen before include "Doha's sheikhdom" , "Sheikdom on the Persian Gulf" , "who won the cup in 2010?" , "State in the Persian Gulf" , "Arab peninsula" .)