Support a couple (5)
I believe the answer is:
brace
This clue is a double definition.
'support' is the first definition.
(brace is a kind of support)
'a couple' is the second definition.
('brace' can be a synonym of 'couple')
(Other definitions for brace that I've seen before include "Support; two" , "Two - supporter" , "Support or hold steady" , "Pair; hand drill" , "Pair - wood-boring tool" .)