Not wearing as much in class (6)
I believe the answer is:
lesson
'class' is the definition.
(I've seen this before)
'not wearing as much in' is the wordplay.
'not' becomes 'less' (I've seen this in other clues).
'wearing as much in' becomes 'on' (I can't explain this - if you can you should believe this answer much more).
'less'+'on'='LESSON'
Can you help me to learn more?
(Other definitions for lesson that I've seen before include "Portion of instruction" , "Severe reproof" , "Moral" , "warning message" , "Seminar" .)