Crossword Genius

Devil concealing tail goes around performing musical form (6)

Ross

I believe the answer is:

sonata

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'musical form' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sonata that I've seen before include "eg Moonlight, Kreutzer" , "See 6" , "musical performance" , "Moonlight, perhaps" , "Instrumental work" .)

I've seen this clue in The Times.
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