Remain for support (4)
I believe the answer is:
stay
I believe this is a double definition.
'remain' is the first definition.
(I know that remain can be written as stay)
'for support' is the second definition.
(stay is a kind of support)
(Other definitions for stay that I've seen before include "Thin strip used to stiffen a garment" , "Don't go!" , "Rope to brace an upright" , "Stop; support" , "control" .)