No American displays 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'
'displays' acts as a link.
(Other definitions for nous that I've seen before include "Common sense, rhymes with house" , "Native wit" , "we found in Sorbonne, for example" , "Informal common sense" , "we recognised in Nancy" .)