Poisonous compound produced from a synthetic protein (8)

I believe the answer is:

atropine

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'poisonous compound' is the definition.
(compound in deadly nightshade)

'a synthetic protein' is the wordplay.
'synthetic' indicates anagramming the letters.
'protein' anagrammed gives 'tropine'.
'a'+'tropine'='ATROPINE'

'produced from' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

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

I've seen this clue in The Guardian.

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