Nothing American about unusual Azeri restaurant (8)
I believe the answer is:
pizzeria
'restaurant' is the definition.
(thesaurus)
'nothing american about unusual azeri' is the wordplay.
'nothing american' becomes 'zip' (US term for zero or nothing).
'about' is a reversal indicator.
'unusual' indicates an anagram.
'zip' reversed gives 'piz'.
'azeri' anagrammed gives 'zeria'.
'piz'+'zeria'='PIZZERIA'
(Other definitions for pizzeria that I've seen before include "Kind of Italian restaurant" , "Italian-style restaurant" , "Type of Italian restaurant" , "Shop that makes popular Italian fare" , "Shop making and selling popular Italian food" .)