Claudius, vis--vis King Hamlet (8)

I believe the answer is:

poisoner

(Other definitions for poisoner that I've seen before include "One who administers the fatal chemical." , "Eg, Dr Crippen" , "Person who uses chemicals to kill" , "Killer using a toxic substance" , "Dr Crippen, perhaps" .)

I've seen this clue in The New York Times.

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