50th US state (6)
I believe the answer is:
hawaii
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">50th us 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 "Fiftieth US state" , "State capital is Honolulu" , "Pacific state of USA" , "50th US state" , "State of the union" .)