Deadly poison (7)

There are a few possibilities for this:

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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 Sydney Morning Herald and The Sun.

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