What a careless dancer might do to offend? (4,2,4,4)

I believe the answer is:

step on ones toes

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'offend?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'what a careless dancer might do to' is the wordplay.
I cannot quite see how this works, but
'a' could be 'one' and 'one' is found in the answer.
'to' is present 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 Hindu.

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