Stop sleeping at college after fire (4,2)
I believe the answer is:
wake up
'fire' is the definition.
(thesaurus)
'stop sleeping at college after' is the wordplay.
'stop sleeping' becomes 'wake' (to wake up is to stop sleeping).
'at college' becomes 'up'.
'after' means one lot of letters go next to another.
'wake'+'up'='WAKE UP'
(Other definitions for wake up that I've seen before include "Rise and shine!" , "one up to speed in Victoria" .)