Changes galore, including liberal tempo (7)
I believe the answer is:
allegro
'tempo' is the definition.
(allegro is a kind of tempo)
'changes galore including liberal' is the wordplay.
'changes' indicates anagramming the letters.
'including' means one lot of letters goes inside another.
'liberal' becomes 'l' (abbreviation).
'galore' with letters rearranged gives 'alegro'.
'alegro' enclosing 'l' is 'ALLEGRO'.
(Other definitions for allegro that I've seen before include "Brisk musical piece" , "Musically, in a lively fashion" , "Quick (of a score)" , "Quickly (in music)" , "At a brisk speed (music)" .)