Divided Croatian city (5)
I believe the answer is:
split
I believe this clue is a double definition.
'divided' is the first definition.
(similar in meaning)
'croatian city' is the second definition.
(I know that Split is Croatian)
(Other definitions for split that I've seen before include "Leave - crack" , "Separate or cut with a tool" , "Cleave lengthwise" , "shop" , "Fork" .)