Drug found on Arctic trip (8)
I believe the answer is:
narcotic
'drug' is the definition.
(I know that drug can be written as narcotic)
'on arctic trip' is the wordplay.
'trip' indicates an anagram.
'on'+'arctic'='onarctic'
'onarctic' anagrammed gives 'NARCOTIC'.
'found' is the link.
(Other definitions for narcotic that I've seen before include "Addictive drug affecting mood or behaviour" , "Drug causing numbness and drowsiness" , "Banned substance" , "this will induce numbness" , "Drug that produces numbness or stupor" .)