Crossword Genius

Boy gets a thank you for composition (6)

Ross

I believe the answer is:

sonata

'for composition' is the definition.
(type of musical composition)

'boy gets a thank you' is the wordplay.
'boy' becomes 'son' (synonyms).
'gets' is a charade indicator (letters next to each other).
'thank you' becomes 'ta' (informal way of saying thank you).
'son'+'a'+'ta'='SONATA'

(Other definitions for sonata that I've seen before include "Eg, Beethoven's Kreutzer or Spring" , "Music for a soloist" , "Musical work for a solo instrument" , "Moonlight, perhaps" , "A musical form" .)

I've seen this clue in The Telegraph.
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