Crossword Genius

Dispersed pieces with celerity! (5)

Ross

I believe the answer is:

speed

I'm a little stuck... Click here to teach me more about this clue!

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

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

Can you help me to learn more?

(Other definitions for speed that I've seen before include "Rate of travel" , "Hasten" , "A devilish quick driver?" , "Velocity" , "Tempo - drug" .)

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