Wrongly help slave girl bend at dance (3,3,4)

I believe the answer is:

aid and abet

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'wrongly help slave' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'girl bend at dance' is the wordplay.
'girl' becomes 'aida' ().
'dance' is an anagram indicator.
'bend'+'at'='bendat'
'bendat' is an anagram of 'ndabet'.
'aida'+'ndabet'='AID AND ABET'

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

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