Remains in a corset (5)
I believe the answer is:
stays
I believe this is a double definition.
'remains' is the first definition.
(to stay in a place is to remain there)
'corset' is the second definition.
(I know that corset can be written as stays)
'in a' is the link.
(Other definitions for stays that I've seen before include "Puts up with" , "Remains; support wires" , "Remains; corset" , "restrictive garments" , "Remains; supporting wires" .)