Voila! A fast tempo! (6)

I believe the answer is:

presto

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'fast tempo' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for presto that I've seen before include "quick to score" , "Very fast (mus.)" , "(In music) fast" , "Hey, it's a magician's word" , "Hey, quickly for a magician" .)

I've seen this clue in The Daily Express.

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