Poison found in any iced confection (7)
I believe the answer is:
cyanide
'poison' is the definition.
(cyanide is poisonous)
'any iced confection' is the wordplay.
'confection' indicates an anagram (I've seen this in other clues).
'any'+'iced'='anyiced'
'anyiced' anagrammed gives 'CYANIDE'.
'found in' is the link.
(Other definitions for cyanide that I've seen before include "Toxic salt" , "Nice day (anag) - poison" , "Poisonous compound" , "Highly toxic substance" , "killer" .)