Crossword Genius

Internal switch in confusion makes a furious woman (6)

Ross

I believe the answer is:

beldam

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'woman' is the definition.
(beldam is a kind of woman)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for beldam that I've seen is " Old woman".)

I've seen this clue in The Hindu.
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