Chief Bolshevik (5)
I believe the answer is:
lenin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chief bolshevik</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lenin that I've seen before include "Leader of the Russian Revolution" , "Revolutionary man" , "V. I. -, Soviet politician and revolutionary" , "Communist leader" , "Vladimir Ilich Ulyanov" .)