Extinguish – powdered tobacco (5)
I believe the answer is:
snuff
I believe this clue is a double definition.
'extinguish' is the first definition.
(I've seen this in another clue)
'powdered tobacco' is the second definition.
(I've seen this in another clue)
(Other definitions for snuff that I've seen before include "gets up your nose?" , "Sniffed stuff" , "Sort of movie" , "Powdered tobacco taken through the nose" , "Put out (candle)" .)