No American shows 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' (United States).
'no'+'us'='NOUS'
'shows' acts as a link.
(Other definitions for nous that I've seen before include "Our (French); practical intelligence (colloq.)" , "Informal common sense" , "Abroad we" , "Common sense: mind or reason" , "Savvy" .)