Eastern eye makeup (4)
I believe the answer is:
'eastern eye makeup' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kohl that I've seen before include "Helmut --, German statesman" , "Black eye-liner; ex-German Chancellor" , "Former German Chancellor" , "'Cosmetic preparation, to outline eyes in black (4)'" , "Black powder for eyes" .)