Crossword Genius

Poisonous plant — it is buried in a geometric shape (7)

Ross

I believe the answer is:

aconite

I'm a little stuck... Click here to teach me more about this clue!

'poisonous plant' is the definition.
(aconite is a kind of poisonous plant)

'it is buried in a geometric shape' is the wordplay.
'is buried in' indicates putting letters inside.
'geometric shape' becomes 'cone' (cone is a kind of shape. I am not sure about the 'geometric' bit.**).
'a'+'cone'='acone'
'it' inserted within 'acone' is 'ACONITE'.

Can you help me to learn more?

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

I've seen this clue in The Guardian.
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