"Amerika" author (5)
I believe the answer is:
'amerika author' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kafka that I've seen before include "Franz ---, Trial, Castle author" , "Franz -, Austrian novelist (The Trial)" , "Novelist's" , "Former Czech novelist" , "Influential German-speaking existential novelist" .)