Remain and support (4)
I believe the answer is:
stay
This clue is a double definition.
'remain' is the first definition.
(I know that remain can be written as stay)
'support' is the second definition.
(stay is a kind of support)
'and' acts as a link.
(Other definitions for stay that I've seen before include "Reside" , "hang about" , "Remain; guy" , "Rope bracing a mast etc" , "Remain - support" .)