Crossword Genius

Cures odd aunt completely? (9)

Ross

I believe the answer is:

antidotes

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'cures' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

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(Other definitions for antidotes that I've seen before include "Cures for poisons" , "Remedies" , "Counteractions to poisons" .)

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