Term that's musical or legal maybe (7)

I believe the answer is:

allegro

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'term that's musical' is the definition.
I know that 'musical' relates to this answer.

'or legal maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'or'+'legal'='orlegal'
'orlegal' is an anagram of 'ALLEGRO'.

Can you help me to learn more?

(Other definitions for allegro that I've seen before include "Fast (mus.)" , "Gaily, lively (music)" , "A fast piece of work" , "Rather fast (music)" , "Scored briskly" .)

I've seen this clue in The Sun and The Globe and Mail.

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