Four couples getting married without being burdened (8)
I believe the answer is:
weighted
'burdened' is the definition.
('weight' can be a synonym of 'burden')
'four couples getting married without' is the wordplay.
'four couples getting' becomes 'eight' (I am not sure about this - if you are sure you should believe this answer much more).
'married' becomes 'wed' (wed can mean married).
'without' is an insertion indicator.
'eight' placed into 'wed' is 'WEIGHTED'.
'being' acts as a link.
Can you help me to learn more?
(Other definitions for weighted that I've seen before include "Given a bias" , "having extra burden to carry" , "Made heavier" , "loaded" .)