Central Asian ruler (4)
I believe the answer is:
khan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">central asian ruler</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 khan that I've seen before include "Imran --, cricketer" , "Eastern emperor" , "Asian ruler (descendant of Genghis?)" , "A Genghis successor?" , "Central Asian prince or chief" .)