Annotates composition without net input from instrumental piece (6)

I believe the answer is:

sonata

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'instrumental piece' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for sonata that I've seen before include "See 6" , "Eg, Beethoven's Kreutzer or Spring" , "Musical work for a solo instrument" , "piece for instrumental soloist" , "Moonlight, perhaps" .)

I've seen this clue in the Sydney Morning Herald.

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