Group making music, or not? (10)
I believe the answer is:
consortium
'group' is the definition.
The answer is an example.
'making music or not?' is the wordplay.
'making' indicates anagramming the letters.
'music'+'or'+'not'='musicornot'
'musicornot' is an anagram of 'CONSORTIUM'.
(Other definitions for consortium that I've seen before include "Association (of several companies)" , "Syndicate" .)