Moonlight maybe somewhat luminous on a tapestry (6)
I believe the answer is:
sonata
'moonlight' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'somewhat luminous on a tapestry' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'SONATA' is hidden in the letters of 'luminous on a tapestry'.
'maybe' acts as a link.
Can you help me to learn more?
(Other definitions for sonata that I've seen before include "Piece of classical music" , "Instrumental work" , "See 6" , "Musical composition for one or two instruments" , "Beethoven's 'Moonlight', for example" .)