Artificial cover for musical bit (9)
I believe the answer is:
hairpiece
'artificial cover' is the definition.
'hairpiece' can be an answer for 'cover' (hairpiece is a kind of cover). I'm unsure of the 'artificial' bit.
'musical bit' is the wordplay.
'musical' becomes 'hair' (1960s musical).
'bit' becomes 'piece' (synonyms).
'hair'+'piece'='HAIRPIECE'
'for' is the link.
Can you help me to learn more?
(Other definitions for hairpiece that I've seen before include "A wig or switch to supplement scalp covering" , "False addition to existing growth on the head" , "rug" , "Using switch" , "Switch, for instance" .)