Korean dictator to the west, trouble for Japanese emperor (6)
I believe the answer is:
mikado
'japanese emperor' is the definition.
(I've seen this before)
'korean dictator to the west trouble' is the wordplay.
'korean dictator' becomes 'kim' (I am not sure about this - if you are sure you should believe this answer much more).
'to the west' shows that the letters should be reversed in order (letters written right to left or 'east to west').
'trouble' becomes 'ado' (both can mean bother or commotion).
'kim' back-to-front is 'mik'.
'mik'+'ado'='MIKADO'
'for' is the link.
Can you help me to learn more?
(Other definitions for mikado that I've seen before include "Gilbert and Sullivan's emperor" , "Japanese emperor's title" , "one of 63 [OPERETTAS]" , "national leader" , "G&S emperor" .)