Henri-Louis ___, distiller who opened his first absinthe distillery in Couvet, Switzerland in 1797 (6)
I believe the answer is:
pernod
(Other definitions for pernod that I've seen before include "Aniseed-flavoured aperitif" , "Aniseed-flavoured drink" , "French aperitif" , "Drink flavoured with aniseed" , "A liqueur flavoured with anise" .)