Greek god of the sea (8)
I believe the answer is:
poseidon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek god of the sea</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for poseidon that I've seen before include "Greek god of the sea and earthquakes" , "underwater missile" , "Controller of the main" , "Sea Lord" , "Olympian" .)