God of light (6)
I believe the answer is:
apollo
'god of light' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apollo that I've seen before include "handsome fellow" , "Handsome Greek god" , "Greek god (twin brother of Artemis)" , "London theatre" , "Handsome young man of Greek mythology" .)