Crossword Genius

Do nocturnal work on a sonata? (9)

Ross

I believe the answer is:

moonlight

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'a sonata?' is the definition.
(moonlight sonata by beethoven)

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

Can you help me to learn more?

(Other definitions for moonlight that I've seen before include "Work in a secondary job" , "Work late" , "do an extra job" , "Night-time illumination" , "Ray" .)

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