Instruction given to musician enticing characters out of training college mischievously (7)

I believe the answer is:

allegro

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'mischievously' is the definition.
Both the definition and answer are adverbs. Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for allegro that I've seen before include "Fast (mus.)" , "Musically fast and lively - legal or what?" , "Musical movement using a brisk speed" , "Rather fast (music)" , "In quick time" .)

I've seen this clue in The Irish Times.

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