About musical furniture (5)
I believe the answer is:
chair
'furniture' is the definition.
(I know that chair is a type of furniture)
'about musical' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'musical' becomes 'hair' (1960s musical).
'c'+'hair'='CHAIR'
(Other definitions for chair that I've seen before include "Presiding officer" , "Single seat" , "Backed seat for one" , "Something with legs" , "academic office" .)