Arrived and left musical material (9)
I believe the answer is:
camelhair
'material' is the definition.
(I know that camelhair is a type of material)
'arrived and left musical' is the wordplay.
'arrived' becomes 'came' (come can mean to appear or arrive).
'and' is a charade indicator (letters next to each other).
'left' becomes 'l' (common abbreviation).
'musical' becomes 'hair' (1960s musical).
'came'+'l'+'hair'='CAMELHAIR'
(Other definitions for camelhair that I've seen before include "Expensive cloth from coat of desert carrier" , "Material for artists' brushes" .)