Crossword Genius

Unscrupulous behaviour in music rehearsal? (5,8)

Ross

I believe the answer is:

sharp practice

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'unscrupulous behaviour' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'music rehearsal?' is the wordplay.
'music' becomes 'sharp' (I can't explain this - if you can you should believe this answer much more).
'rehearsal?' becomes 'practice' (rehearsal is a kind of practice).
'sharp'+'practice'='SHARP PRACTICE'

'in' is the link.

Can you help me to learn more?

(Other definitions for sharp practice that I've seen before include "Unscrupulous dealing" , "Dishonesty" , "cheating" , "Dodgy dealings" , "Dishonest dealings" .)

I've seen this clue in The Telegraph.
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