Good in English or in French bad (5)
I believe the answer is:
moral
'good in english' is the definition.
'moral' can be an answer for 'good' (I've seen this in another clue). I'm unsure of the 'in english' bit.
'or in french bad' is the wordplay.
'in' indicates putting letters inside.
'french bad' becomes 'mal' (I am not sure about this - if you are sure you should believe this answer much more).
'or' placed inside 'mal' is 'MORAL'.
Can you help me to learn more?
(Other definitions for moral that I've seen before include "Pertaining to right and wrong conduct" , "ethical standard" , "knowing right from wrong" , "Righteous" , "Lesson offered by story" .)