US island state (6)
I believe the answer is:
hawaii
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">us island state</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hawaii that I've seen before include "holiday island" , "State capital is Honolulu" , "USA's 50th state" , "US Pacific island state" , "50th state of the USA" .)