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Voila! A tempo! (6)

Ross

I believe the answer is:

presto

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'tempo' is the definition.
(musical tempo)

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

Can you help me to learn more?

(Other definitions for presto that I've seen before include "Very fast (mus.)" , "In quick tempo (mus.)" , "Moving quickly" , "Immediately" , "hey......,cries the magician" .)

I've seen this clue in The Daily Express.
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