Parcel up music in auditorium (4)
I believe the answer is:
wrap
'parcel up' is the definition.
(I've seen this before)
'music in auditorium' is the wordplay.
'music' becomes 'rap' (musical genre).
'in auditorium' shows a homophone (sound like) (as the word might sound to an audience).
'rap' is a homophone of 'WRAP'.
(Other definitions for wrap that I've seen before include "Finish filming" , "End of a filming session" , "Cover; loose garment" , "Cover, enfold" , "Fold covering around something" .)