Good French, going back onto the French can make one noble (7)
I believe the answer is:
ennoble
'can make one noble' is the definition.
I can't tell whether this defines the answer.
'good french going back onto the french' is the wordplay.
'good french' becomes 'bonne' ('good' in French).
'going back' is a reversal indicator.
'onto' means one lot of letters go next to another.
'the french' becomes 'le' ('the' in French).
'bonne' back-to-front is 'ennob'.
'ennob'+'le'='ENNOBLE'
Can you help me to learn more?
(Other definitions for ennoble that I've seen before include "Lend greater dignity to" , "Create" , "Give rank or title to (someone)" , "Elevate to the aristocracy" , "Elevate in rank" .)