Russian president (5)
I believe the answer is:
putin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian president</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Vladimir Putin)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for putin that I've seen before include "Russian president" , "Russian leader" , "Introduce" , "powerful leader" .)