Crossword Genius

Tempo of the piano in something often broadcast (5)

Ross

I believe the answer is:

speed

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'tempo' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for speed that I've seen before include "The going rate" , "Rapidity of movement" , "Rate of travel" , "Move quickly (and illegally?)" , "Swiftness" .)

I've seen this clue in the Evening Standard.
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