Old time dance music, quick! (5)

I believe the answer is:

galop

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'dance music quick' is the definition.
'galop' can be an answer for 'dance' (I've seen this in another clue). I am not sure about the 'music quick' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for galop that I've seen before include "dance music" , "Couple dance" , "Lively ballroom dance" , "Nineteenth-century dance" .)

I've seen this clue in the Evening Standard.

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