Moonlight music? (6)
I believe the answer is:
sonata
This clue might be a double definition.
'moonlight' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'music?' is the second definition.
(sonata is a kind of music)
Can you help me to learn more?
(Other definitions for sonata that I've seen before include "Musical composition for one or two instruments" , "Sat on a kind of composition" , "Instrumental work" , "Composition for 1 or 2 instruments, with 3 or 4 movements" , "See 6" .)