Corporate bigwig (3)
I believe the answer is:
ceo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">corporate 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 ceo that I've seen before include "Initially, the top boss" , "Initially, top man in an organisation" , "Initials commonly used for top boss" .)