An iced cocktail containing unknown poisonous chemical (7)

I believe the answer is:

cyanide

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'poisonous chemical' is the definition.
'cyanide' can be an answer for 'chemical' (thesaurus). I am not certain of the 'poisonous' bit.

'an iced cocktail containing unknown' is the wordplay.
'cocktail' is an anagram indicator.
'containing' is an insertion indicator.
'unknown' becomes 'y' (algebra).
'an'+'iced'='aniced'
'aniced' with letters rearranged gives 'canide'.
'canide' going around 'y' is 'CYANIDE'.

Can you help me to learn more?

(Other definitions for cyanide that I've seen before include "Highly toxic substance" , "Nice day (anag) - poison" , "Toxic salt" , "Extremely poisonous salt" , "Poisonous compound" .)

I've seen this clue in The Hindu.

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