Chief of the Greek gods (4)
I believe the answer is:
zeus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chief of the greek gods</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for zeus that I've seen before include "Supreme god of the ancient Greeks" , "old Greek" , "Greeks' supreme deity" , "Supreme god of Greek myth" , "Supreme god of ancient Greek mythology" .)