Crossword Genius

Poisonous substance (5)

Ross

I believe the answer is:

toxin

'poisonous substance' is the definition.
(I know that toxin is a type of poisonous substance)

This is the entire clue.

(Other definitions for toxin that I've seen before include "Form of poison" , "Poison, venom" , "Poisonous substance" , "Poison of organic origin" , "Natural poison" .)

I've seen this clue in The Times, the Newsday and the Sydney Morning Herald.
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