Greek war god (4)
I believe the answer is:
ares
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek war god</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 ares that I've seen before include "figure of worship" , "Olympian" , "Land measures" , "Greek god of war" , "War-god" .)