Pacific island; the world's smallest republic (5)
I believe the answer is:
nauru
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">pacific island</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">the world's smallest republic</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for nauru that I've seen before include "Small Pacific republic" , "SW Pacific republic" , "Fairground carousel" , "Pacific coral island republic, once rich in phosphates" , "Island country in Micronesia" .)