Toss out of school (5)
I believe the answer is:
expel
'toss out of school' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for expel that I've seen before include "Throw out" , "Ban from school" , "Drive out with force" , "Banish (undesirable alien?)" , "Evict" .)