Political unit (10)
I believe the answer is:
federation
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">political unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(federation is a kind of political unit)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for federation that I've seen before include "Union of states" , "Group of states" , "Russia, for one" , "Alliance" .)