Stake keeps one in place (5)
I believe the answer is:
posit
'place' is the definition.
(positing is a kind of placing)
'stake keeps one' is the wordplay.
'stake' becomes 'post' ('post' can be a synonym of 'stake').
'keeps' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'post' going around 'i' is 'POSIT'.
'in' is the link.
(Other definitions for posit that I've seen before include "Put forward (as fact)" , "state" , "forward-looking statement" , "Assume something as a basis for discussion" , "Suppose" .)