Crossword Genius

Did Beethoven write one by moonlight? (6)

Ross

I believe the answer is:

sonata

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sonata that I've seen before include "Musical composition with three or more contrasting movements" , "composition for piano, perhaps" , "Piece of classical music" , "Music for a soloist" , "Chamber work" .)

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