Stop having a bearing in the case (5)
I believe the answer is:
cease
'stop' is the definition.
('cease' can be a synonym of 'stop')
'a bearing in the case' is the wordplay.
'a bearing' becomes 'e'.
'in the' indicates putting letters inside.
'e' put within 'case' is 'CEASE'.
'having' acts as a link.
(Other definitions for cease that I've seen before include "Discontinue" , "Come to an end" , "Stop, give over" , "Stop, terminate" , "Culminate" .)