Some of the sung odes are about Helios (3,3)
I believe the answer is:
sun god
'helios' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'some of the sung odes are about' is the wordplay.
'some of' becomes 'o'.
'odes are' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'sung'+'d'='sungd'
'o' put within 'sungd' is 'SUN-GOD'.
Can you help me to learn more?
(Other definitions for sun god that I've seen before include "RA" , "Amen-Ra" .)