Brisk tempo (7)
I believe the answer is:
allegro
'brisk tempo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for allegro that I've seen before include "Brisk mus. speed" , "(In music) a brisk and lively tempo" , "'Brisk and lively, musically (7)'" , "Quickly (in music)" , "Musically, in a lively fashion" .)