Delightful stupor with music playing (11)
I believe the answer is:
scrumptious
'delightful' is the definition.
(thesaurus)
'stupor with music playing' is the wordplay.
'with' means one lot of letters go next to another.
'playing' is an anagram indicator.
'stupor' put after 'music' is 'musicstupor'.
'musicstupor' with letters rearranged gives 'SCRUMPTIOUS'.
(Other definitions for scrumptious that I've seen before include "very good" , "Extremely delicious" , "Toothsome" , "Delightful" , "Yummy" .)