Remains after rearranging student meeting (7)
I believe the answer is:
seminar
'student meeting' is the definition.
(university class)
'remains after rearranging' is the wordplay.
'after rearranging' indicates an anagram.
'remains' anagrammed gives 'SEMINAR'.
(Other definitions for seminar that I've seen before include "Teaching meeting, conference" , "workshop" , "Marines (anag.)" , "Group discussing" , "Study group on specific subject" .)