Persian Gulf nation (5)
I believe the answer is:
qatar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">persian gulf nation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)