Helmut __, chancellor widely credited with the unification of Germany in 1990 (4)

I believe the answer is:

kohl

(Other definitions for kohl that I've seen before include "Black powder for eyes" , "Black powder used as eye make-up" , "Former German Chancellor" , "'Cosmetic preparation, to outline eyes in black (4)'" , "Helmut --, German statesman" .)

I've seen this clue in The Guardian.

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