Orchestra performed 'Beast of Burden (9)
I believe the answer is:
carthorse
''beast of burden' is the definition.
(I've seen this before)
'orchestra performed' is the wordplay.
'performed' indicates an anagram.
'orchestra' is an anagram of 'CARTHORSE'.
(Other definitions for carthorse that I've seen before include "Beast of burden" , "has pulling power" , "large drawer" , "Equine" .)