Poison developed from a protein (8)

I believe the answer is:

atropine

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

'developed from a protein' is the wordplay.
'a protein' can be anagrammed to 'ATROPINE'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for atropine that I've seen before include "Poison found in deadly nightshade used as a drug" , "A pointer (anag) - belladonna" , "Poisonous substance" , "Drug obtained from deadly nightshade" .)

I've seen this clue in The Times.

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