Crossword Genius

Poisonous element (7)

Ross

I believe the answer is:

arsenic

'poisonous element' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for arsenic that I've seen before include "Toxic metallic element used as rat poison" , "As briefly identified" , "Element with many poisonous compounds" , "Poison used in pesticides and weedkillers" , "Powerful poison" .)

I've seen this clue in The Star Tribune, the Sydney Morning Herald and The Guardian.
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