Sioux City's state (4)
I believe the answer is:
iowa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sioux city's state</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 iowa that I've seen before include "US swing electoral state" , "State of USA" , "part of US" , "part of United States" , "American state, capital Des Moines" .)