Tell amongst the class (6)
I believe the answer is:
inform
'tell' is the definition.
(I know this)
'amongst the class' is the wordplay.
'amongst' becomes 'in' (I am not sure about this - if you are sure you should believe this answer much more).
'the class' becomes 'form' ('form' can be a synonym of 'class').
'in'+'form'='INFORM'
Can you help me to learn more?
(Other definitions for inform that I've seen before include "Brief" , "Give information to (someone)" , "Impart knowledge" , "Provide facts - playing well" , "Pass on knowledge" .)