Part company in Croatian resort (5)
I believe the answer is:
split
I believe this is a double definition.
'part company' is the first definition.
(I've seen this before)
'croatian resort' is the second definition.
(Croatian city)
'in' is the link.
(Other definitions for split that I've seen before include "Left" , "somewhere on the Adriatic?" , "Divide; leave suddenly" , "Break forcibly" , "Break; leave suddenly" .)