In English and French says "Revise it" (4)
I believe the answer is:
edit
'in english and french says revise it' is the definition.
I can't judge whether this defines the answer.
'english and french says revise it' is the wordplay.
'english' becomes 'E' (abbreviation).
'and' is a charade indicator (letters next to each other).
'french says revise' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'e'+'d'+'it'='EDIT'
Can you help me to learn more?
(Other definitions for edit that I've seen before include "Alter text" , "Amend and correct" , "Amend text" , "Make changes to (text)" , "Check text for publication" .)