Unfortunately, a smellier city (9)
I believe the answer is:
marseille
'city' is the definition.
(Marseille is an example)
'unfortunately a smellier' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'a'+'smellier'='asmellier'
'asmellier' anagrammed gives 'MARSEILLE'.
(Other definitions for marseille that I've seen before include "Major seaport of Southern France" , "French city" , "fabric" , "French port" , "Port city of France" .)