Head, leader (5)
I believe the answer is:
chief
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">head</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">leader</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that chief is a type of leader)</span><br/ ><br/ ></span>
(Other definitions for chief that I've seen before include "arch" , "Head of a native American tribe" , "Ordinary type" , "Tribal head" , "Principal" .)