At a brisk tempo, musically (7)

I believe the answer is:

allegro

(Other definitions for allegro that I've seen before include "Brisk mus. speed" , "To be performed in brisk style" , "A fast piece of work" , "Musically fast and lively - legal or what?" , "(In music) briskly" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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