Remain and support (4)
I believe the answer is:
stay
I believe this is a double definition.
'remain' is the first definition.
(I know that stay is a more specific form of remain)
'support' is the second definition.
(I know that stay is a type of brace)
'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" .)