Fiddle turned into crime (9)
I believe the answer is:
violation
'crime' is the definition.
(violation is a kind of crime)
'fiddle turned into' is the wordplay.
'fiddle' becomes 'viola' (I've seen this before).
'turned' is an anagram indicator.
'into' is an anagram of 'tion'.
'viola'+'tion'='VIOLATION'
(Other definitions for violation that I've seen before include "Infringement" , "Breach" , "Offence" , "abuse" , "outrage" .)