God who hurls lightning bolts (4)
I believe the answer is:
zeus
'god who hurls lightning bolts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for zeus that I've seen before include "Ancient Greek god, son of Rhea and Cronus" , "Supreme Greek deity" , "Celestial ruler" , "Ancient Greece's top god" , "Supreme god of the ancient Greeks" .)