Cur crazy about a city... (9)
I believe the answer is:
rotterdam
'a city' is the definition.
(Rotterdam is an example)
'cur crazy about' is the wordplay.
'cur' becomes 'rotter' (I've seen this in another clue).
'crazy' becomes 'mad' (synonyms).
'about' shows that the letters should be reversed in order.
'mad' backwards is 'dam'.
'rotter'+'dam'='ROTTERDAM'
(Other definitions for rotterdam that I've seen before include "One of the world's largest ports" , "Netherlands port" , "European port" , "Major North Sea port - tarred tom (anag)" , "Dutch city and port" .)