Woman unaffected by reversals (5)

I believe the answer is:

madam

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'woman' is the definition.
(used to address a woman)

I don't understand the remainder of the clue.

(Other definitions for madam that I've seen before include "Leader of House of Congress" , "How one may address a woman" , "Bossy girl" , "Polite form of address for a woman" , "Woman of standing" .)

I've seen this clue in The Irish News.

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