Staff to remain (5)
I believe the answer is:
stick
I believe this is a double definition.
'staff' is the first definition.
(I've seen this before)
'remain' is the second definition.
(both can mean to stay)
'to' is the link.
(Other definitions for stick that I've seen before include "Adhere; baton" , "Baton; gum" , "Staff - criticism" , "Flak - cling" , "Gear lever; adhere" .)