Crossword Genius

Music by Moonlight? (6)

Ross

I believe the answer is:

sonata

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

This clue might be a double definition.

'music' is the first definition.
(sonata is a kind of music)

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

'by' acts as a link.

Can you help me to learn more?

(Other definitions for sonata that I've seen before include "Instrumental work" , "Musical composition for one instrument or two" , "just for one or two players?" , "Musical composition with three or more contrasting movements" , "Music to play (not sing)" .)

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