Sensible attitude excluding America? (4)
I believe the answer is:
nous
'sensible attitude' is the definition.
(nous can mean good sense)
'excluding america?' is the wordplay.
'excluding' becomes 'no'.
'america?' becomes 'us' (United States).
'no'+'us'='NOUS'
(Other definitions for nous that I've seen before include "Knowledge, experience" , "we found in Sorbonne, for example" , "How the French describe their own" , "French common sense" , "Gumption" .)