Supervisor, manager (8)
I believe the answer is:
director
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">supervisor</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(director is a kind of supervisor)</span><br/ ><br/ >'<span class="explanation-format__original">manager</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for director that I've seen before include "Senior person in a firm, executive or non-executive" , "One on board" , "Big cheese" , "Business manager or film maker" , "Record it (anag.)" .)