No American has common sense (4)
I believe the answer is:
nous
'common sense' is the definition.
(nous is a kind of common sense)
'no american' is the wordplay.
'american' becomes 'us' (abbreviation for United States).
'no'+'us'='NOUS'
'has' acts as a link.
(Other definitions for nous that I've seen before include "we found in Sorbonne, for example" , "Knowledge, experience" , "Common sense - intellect" , "Sound practical judgement" , "FT in Paris, say" .)