Crossword Genius

Ready for a spanking? Mind your own business! (4,3)

Ross

I believe the answer is:

butt out

I'm a little stuck... Click here to teach me more about this clue!

'a spanking? mind your own business' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'ready for' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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