Mideast bigwig (4)
I believe the answer is:
emir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mideast bigwig</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 emir that I've seen before include "Ruler or chieftain in Arabia" , "Islamic chieftain" , "Arab ruler" , "Arab chieftain" , "Title of various rulers; I'm ER (anag.)" .)