Band or artist's carrying case (9)
I believe the answer is:
orchestra
'band' is the definition.
(thesaurus)
'or artist's carrying case' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'carrying' says to put letters next to each other.
'case' becomes 'chest' (**).
'ra' put after 'chest' is 'chestra'.
'or'+'chestra'='ORCHESTRA'
(Other definitions for orchestra that I've seen before include "Eg, LSO, RPO" , "bandsmen?" , "Other cars (anag.)" , "Large band of players" , "Large band of musicians" .)