Students take them in class (5)
I believe the answer is:
notes
'students take them in class' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for notes that I've seen before include "Stone with jottings" , "Written comments" , "Brief written records" , "Doh, re, mi, ..." , "eg E F G (mus.)" .)