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Playing the violin involved a bit of sharp practice (2,3,6)

Ross

I believe the answer is:

on the fiddle

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'involved a bit of sharp practice' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'playing the violin' is the wordplay.
'playing' becomes 'on' (on can mean playing or performing).
'violin' becomes 'fiddle' (synonyms).
'on'+'the'+'fiddle'='ON THE FIDDLE'

Can you help me to learn more?

(Other definitions for on the fiddle that I've seen before include "Dishonest" , "Cheating (colloq.)" , "Involved in swindling" , "Engaged in cheating" , "leader of the orchestra?" .)

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