Remains to give support (5)
I believe the answer is:
stays
'remains' is the definition.
(to stay in a place is to remain there)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stays that I've seen before include "old underwear" , "Stanchions" , "Corsets" , "Old-fashioned corset" , "... holidays" .)