At a brisk tempo (7)
I believe the answer is:
allegro
'at a brisk tempo' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for allegro that I've seen before include "In a brisk and lively manner" , "Moving fast" , "Instruction to perform in lively fashion" , "Scored at a brisk speed" , "Brisk movement or passage" .)