Greek sun-god (6)
I believe the answer is:
apollo
'greek sun-god' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for apollo that I've seen before include "Deity" , "Greek god - US space programme dedicated to moon landings - butterfly" , "handsome chap" , "Greek sungod, son of Zeus" , "Divine figure" .)