Gleeman's new medley (7)
I believe the answer is:
melange
'medley' is the definition.
(I've seen this before)
'gleeman's new' is the wordplay.
'new' indicates anagramming the letters.
'gleeman' anagrammed gives 'MELANGE'.
(Other definitions for melange that I've seen before include "mixed collection" , "A French mixture of me with angel" , "Miscellany" , "Varied mixture" , "Medley" .)