Bolshevik leader (5)
I believe the answer is:
lenin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bolshevik leader</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 lenin that I've seen before include "Vladimir Ilich Ulyanov" , "Head of the Communist state after the fall of the Tsar" , "Marxist theoretician" , "Leader of the Russian Revolution" , "Communist leader" .)