Shock article repelled Arctic resident (5)
I believe the answer is:
appal
'shock' is the definition.
('appal' can be a synonym of 'shock')
'article repelled arctic resident' is the wordplay.
'article' becomes 'a' (indefinite article).
'repelled' shows that the letters should be reversed in order.
'arctic resident' becomes 'lapp'.
'lapp' reversed gives 'ppal'.
'a'+'ppal'='APPAL'
(Other definitions for appal that I've seen before include "Fill with horror" , "Greatly horrify" , "exhibiting dismay" , "To shock, dismay" , "Petrify" .)