Class remains disorganised (7)
I believe the answer is:
seminar
'class' is the definition.
(I know that seminar is a type of class)
'remains disorganised' is the wordplay.
'disorganised' is an anagram indicator.
'remains' with letters rearranged gives 'SEMINAR'.
(Other definitions for seminar that I've seen before include "Training conference" , "Discussion meeting" , "Symposium" , "Marines (anag.)" , "Training meeting" .)