Crossword Genius

Poison can rise when dissolved (7)

Ross

I believe the answer is:

arsenic

'poison' is the definition.
(arsenic can be used as a poison)

'can rise when dissolved' is the wordplay.
'when dissolved' is an anagram indicator.
'can'+'rise'='canrise'
'canrise' is an anagram of 'ARSENIC'.

(Other definitions for arsenic that I've seen before include "Element with many poisonous compounds" , "-- and Old Lace (play)" , "Poison used in pesticides and weedkillers" , "killer" , ", it goes with old lace" .)

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