Where, in New York, the French are in the wrong (6)
I believe the answer is:
harlem
'where in new york' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'the french are in the wrong' is the wordplay.
'the french' becomes 'le'.
'are in' indicates putting letters inside.
'the wrong' becomes 'harm' (I am not sure about this - if you are sure you should believe this answer much more).
'le' put into 'harm' is 'HARLEM'.
Can you help me to learn more?
(Other definitions for harlem that I've seen before include "Father (French)" , "NY community" , "New York neighbourhood" , "Area of New York city" , "District of New York" .)