Reorganised recital including new instrument (8)
I believe the answer is:
clarinet
'instrument' is the definition.
(clarinet is a kind of instrument)
'reorganised recital including new' is the wordplay.
'reorganised' indicates anagramming the letters.
'including' means one lot of letters goes inside another.
'new' becomes 'n'.
'recital' is an anagram of 'clariet'.
'clariet' going around 'n' is 'CLARINET'.
(Other definitions for clarinet that I've seen before include "Single reed woodwind instrument" , "Music-maker" , "Music maker" , "Single-reed straight-tubed instrument" , "Woodwind instrument - Artie Shaw played one" .)