43rd US state (5)
I believe the answer is:
idaho
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">43rd 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 idaho that I've seen before include "agricultural land" , "US state S. of Montana" , "My Own Private -- (1991 film)" , "The Gem State, known for its potatoes" , "One of 22 Across, capital Boise" .)