Supreme Greek god (4)
I believe the answer is:
zeus
'supreme greek god' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zeus that I've seen before include "Chief Greek god" , "Ancient Greek god, son of Rhea and Cronus" , "His statue was one of Seven Wonders of the World" , "Greek god - husband and brother of Hera" , "Suez (anag)" .)