Leader or chief (4)
I believe the answer is:
boss
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">leader</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that leader can be written as boss)</span><br/ ><br/ >'<span class="explanation-format__original">chief</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that chief can be written as boss)</span><br/ ><br/ ></span>
(Other definitions for boss that I've seen before include "Domineer" , "Stud; chief" , "One managing" , "Person managing" , "Take charge of" .)