Crossword Genius

Joplin’s field for Cinderella’s wee hours? (7)

Ross

I believe the answer is:

ragtime

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'hours?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for ragtime that I've seen before include "Scott Joplin music style" , "Style of piano music" , "Kind of music" , "Song and dance" , "Type of music" .)

I've seen this clue in the Sydney Morning Herald.
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