Banish, exile (5)
I believe the answer is:
expel
This clue is a double definition.
'banish' is the first definition.
(I know that banish is a kind of expel)
'exile' is the second definition.
(I know that exile is a kind of expel)
(Other definitions for expel that I've seen before include "Force to leave" , "Discharge in disgrace" , "Ban from school" , "Oust" , "Eject (from school)" .)