Not free to wed (7)

I believe the answer is:

engaged

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'not free' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for engaged that I've seen before include "Absorbed" , "Held" , "Promised - book - fighting" , "Preoccupied" , "Taken on - betrothed" .)

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

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