Deadly poison (7)

There are a few possibilities for this:

Which length description are you looking for?:

7,4

cyanide

arsenic

'deadly poison' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cyanide that I've seen before include "Highly toxic substance" , "Nice day (anag) - poison" , "Poisonous compound" , "killer" , "Toxic salt" .)

I've seen this clue in The Sun and the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.