National council in former USSR (6)
I believe the answer is:
soviet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">national council in former ussr</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 soviet that I've seen before include "Communist government council" , "Relating to the USSR" , "Cold war rival" , "Elected council in a communist country" , "Russian workers' council, originally" .)