Slav taken in by Kaiser Bill (4)
I believe the answer is:
serb
'slav' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'taken in by kaiser bill' is the wordplay.
'taken in by' indicates a hidden word.
'SERB' is hidden in the letters of 'kaiser bill'.
Can you help me to learn more?
(Other definitions for serb that I've seen before include "Someone from Belgrade?" , "One from Belgrade" , "Native of the Balkans" , "A European national" , "From Belgrade, perhaps" .)