Croatian's battered mac (8)
I believe the answer is:
raincoat
'mac' is the definition.
(macintosh is a type of raincoat)
'croatian's battered' is the wordplay.
'battered' is an anagram indicator.
'croatian' with letters rearranged gives 'RAINCOAT'.
(Other definitions for raincoat that I've seen before include "Protective garment for Croatian" , "Wet weather gear" , "Outer garment for Croatian" , "Mac" , "Mackintosh" .)