Girl changing into something shocking! (9)

I believe the answer is:

violation

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'something shocking' is the definition.
I can't judge whether this defines the answer.

'girl changing into' is the wordplay.
'girl' becomes 'viola' ().
'changing' indicates anagramming the letters.
'into' anagrammed gives 'tion'.
'viola'+'tion'='VIOLATION'

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(Other definitions for violation that I've seen before include "Offence" , "abuse" , "Infringement" , "outrage" , "Breach" .)

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