Support couple (5)
I believe the answer is:
brace
This clue is a double definition.
'support' is the first definition.
(I know that brace is a more specific form of the action support)
'couple' is the second definition.
(brace can mean a pair of something)
(Other definitions for brace that I've seen before include "Strengthener; pair" , "Two - supporter" , "Pair; hand drill" , "Teeth straightener" , "Support - pair" .)