Greek god of light, poetry and music (6)
I believe the answer is:
apollo
I believe this is a triple definition!
'greek god of light' is the first definition.
(I've seen this before)
'poetry' is the second definition.
(thesaurus)
'and' acts as a link.
'music' is the third definition.
(thesaurus)
(Other definitions for apollo that I've seen before include "God of light and US space programme" , "Greek god (twin brother of Artemis)" , "Greek god of light, poetry, music, healing and prophecy" , "mission of high-flying Americans?" , "Greek (and Roman) god of light, poetry etc" .)