United we stand - all but Stan (3)

I believe the answer is:

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'united' is the definition.
(united in marriage)

'we stand all but stan' is the wordplay.
I cannot quite see how this works, but
'we' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for wed that I've seen before include "united" , "Take in marriage" , "Marry" , "Join" , "Espouse" .)

I've seen this clue in the Evening Standard.

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