Biased octet in wedlock? (8)

I believe the answer is:

weighted

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'biased' is the definition.
(as in a biased or weighted sample)

'octet in wedlock?' is the wordplay.
'octet' becomes 'eight' (synonyms).
'in' indicates putting letters inside.
'wedlock?' becomes 'wed' (I can't justify this - if you can you should give a lot more credence to this answer).
'eight' inserted into 'wed' is 'WEIGHTED'.

Can you help me to learn more?

(Other definitions for weighted that I've seen before include "loaded" , "Made heavier" , "Given a bias" , "having extra burden to carry" .)

I've seen this clue in the Sydney Morning Herald.

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