Crossword Genius

Element, symbol As (7)

Ross

I believe the answer is:

arsenic

(Other definitions for arsenic that I've seen before include "Powerful poison" , "Poison used in pesticides and weedkillers" , "Poisons in scare" , ", it goes with old lace" , "Toxic metallic element used as rat poison" .)

I've seen this clue in The Times.
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