Addictive substance reviewed in notice (8)
I believe the answer is:
nicotine
'addictive substance' is the definition.
(nicotine is addictive)
'reviewed in notice' is the wordplay.
'reviewed' indicates an anagram (letters reviewed or revised).
'in'+'notice'='innotice'
'innotice' is an anagram of 'NICOTINE'.
(Other definitions for nicotine that I've seen before include "Drug in tobacco" , "Addictive drug" , "Poison not in ice" , "I net coin from a popular poison" , "Toxic substance in tobacco" .)