His magical apprentice created some spellbinding music (8)
I believe the answer is:
sorcerer
'his magical apprentice created some spellbinding' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'music' is the wordplay.
I cannot quite see how this works, but
'music' could be 'so' (as in do re mi fa so la ti) and 'so' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sorcerer that I've seen before include "Magician with musical apprentice" , "Potter, say" , "Magician aided by evil spirits" , "Necromancer or wizard" , "In stories, he has magical powers that he uses to harm others" .)