Crossword Genius

Once it is compounded with a poison (7)

Ross

I believe the answer is:

aconite

'poison' is the definition.
(I've seen this before)

'once it is compounded with a' is the wordplay.
'is compounded with' indicates anagramming the letters.
'once'+'it'='onceit'
'onceit' mixed up with 'a' can make 'ACONITE'.

(Other definitions for aconite that I've seen before include "Flower, for example monkshood or wolfsbane" , "Yellow-flowered plant" , "potential killer" , "Poisonous flowering plant" , "Spring flower - poison" .)

I've seen this clue in the Evening Standard and The Irish Independent.
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