Acumen for us French (4)
I believe the answer is:
nous
'french' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'acumen for us' is the wordplay.
'acumen for' becomes 'no' (I am not sure about this - if you are sure you should believe this answer much more).
'no'+'us'='NOUS'
Can you help me to learn more?
(Other definitions for nous that I've seen before include "Gumption" , "Abroad we" , "we recognised in Nancy" , "Common-sense" , "Common sense: mind or reason" .)