Crossword Genius

Sad Menuhin resigns after prelude to botched tune (5,2,8)

Ross

I believe the answer is:

bring me sunshine

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'botched tune' is the definition.
I know nothing about this answer so I can't judge whether this works.

'sad menuhin resigns after prelude' is the wordplay.
'sad' is an anagram indicator.
'after' is a charade indicator (letters next to each other).
'prelude' becomes 'b' (I can't explain this - if you can you should believe this answer much more).
'menuhin'+'resigns'='menuhinresigns'
'menuhinresigns' is an anagram of 'ringmesunshine'.
'ringmesunshine' put after 'b' is 'BRING ME SUNSHINE'.

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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