Music provided by Charlie and the girls (8)
I believe the answer is:
cavatina
'music' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?
'by charlie and the girls' is the wordplay.
I cannot quite see how this works, but
'by' could be 'at' and 'at' is found within the answer.
'charlie' could be 'c' (phonetic alphabet: alpha, bravo, charlie etc.) and 'c' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
The remaining letters 'avia' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'provided' is the link.
Can you help me to learn more?
(Other definitions for cavatina that I've seen before include "simple song" , "air" , "Simple operatic aria" .)