Lessons from Master before exams (6)
I believe the answer is:
morals
'lessons' is the definition.
(the moral of a story is its lesson)
'master before exams' is the wordplay.
'master' becomes 'm'.
'before' says to put letters next to each other.
'exams' becomes 'orals' (oral is a kind of exam).
'm'+'orals'='MORALS'
'from' acts as a link.
(Other definitions for morals that I've seen before include "Principles or rules of right and wrong" , "Ethical motives" , "code?" , "Standards of behaviour" , "Principles based on right and wrong" .)