Freedom from obligation to include first pieces from Miraculous Mandarin in one concert (8)
I believe the answer is:
immunity
'freedom from obligation' is the definition.
(freedom from a particular duty or obligation)
'include first pieces from miraculous mandarin in one concert' is the wordplay.
'include first' becomes 'i' (mst letter of 'include').
'pieces from miraculous mandarin in' becomes 'mm' (I can't explain this - if you can you should believe this answer much more).
'one concert' becomes 'unity' (concert can mean agreement or unity).
'i'+'mm'+'unity'='IMMUNITY'
'to' acts as a link.
(Other definitions for immunity that I've seen before include "Safety from prosecution, disease etc" , "Inability to catch a cold" , "Protection from disease or punishment" , "Exemption (from disease, prosecution etc)" , "legal protection?" .)