Crossword Genius

In Act One I found a monkshood plant (7)

Ross

I believe the answer is:

aconite

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

'plant' is the definition.
(I know that aconite is a type of poisonous plant)

'in act one i found a monkshood' is the wordplay.
'act one i' anagrams to 'ACONITE'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

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

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