Replacement of wife for new betrayer (6)

I believe the answer is:

switch

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'replacement' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for switch that I've seen before include "Control for making or breaking connections" , "It may be thrown" , "Change round" , "Change over - long twig" , "Change - debit card" .)

I've seen this clue in The Hindu.

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