Feature a nation (5)
I believe the answer is:
china
'nation' is the definition.
(China is an example)
'feature a' is the wordplay.
'feature' becomes 'chin' (chin is a kind of feature).
'chin'+'a'='CHINA'
(Other definitions for china that I've seen before include "Modern name for old Cathay" , "High-quality porcelain" , "Delicate porcelain from Cathay?" , "Household ceramics" , "Ceramic; friend (colloq.)" .)