Supreme god of the ancient Greeks (4)
I believe the answer is:
zeus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">supreme god of the ancient greeks</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for zeus that I've seen before include "Great being in Greece" , "Greek god - husband and brother of Hera" , "Top Greek god" , "Divine son of Cronos and Rhea" , "Suez (anag)" .)