Crossword Genius

Poisonous element (7)

Ross

I believe the answer is:

arsenic

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">poisonous element</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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