Divide pupils as term breaks up (6)
I believe the answer is:
stream
'divide pupils' is the definition.
'stream' can be an answer for 'pupils' (stream can mean a class of similarly able pupils). I am not sure about the 'divide' bit.
'as term breaks up' is the wordplay.
'breaks up' indicates anagramming the letters.
'as'+'term'='asterm'
'asterm' anagrammed gives 'STREAM'.
Can you help me to learn more?
(Other definitions for stream that I've seen before include "Steady flow; pupil group" , "Flow of water on land" , "Flow from master" , "Master of a tributary" , "group of schoolchildren" .)