Betrothed and already fighting! (7)

I believe the answer is:

engaged

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'betrothed' is the definition.
(I know that betrothed can be written as engaged)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for engaged that I've seen before include "Taken on - betrothed" , "Affianced" , "Fully committed - to get married?" , "Betrothed - busy" , "preparing for the match?" .)

I've seen this clue in The Globe and Mail.

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