Couples holding things up (6)
I believe the answer is:
braces
'couples' is the definition.
('brace' can be a synonym of 'couple')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for braces that I've seen before include "bolsters" , "Straps holding up trousers" , "Trouser support" , "Props or trouser-supporters" , "Dental appliances and pairs" .)