Move restlessly around the capital of Norway, causing spite (5)
I believe the answer is:
venom
'spite' is the definition.
(synonyms)
'move restlessly around the capital of norway' is the wordplay.
'restlessly' indicates anagramming the letters (I've seen this in other clues).
'around' indicates putting letters inside.
'the capital of' indicates taking the first letters.
The first letter of 'norway' is 'n'.
'move' is an anagram of 'veom'.
'veom' going around 'n' is 'VENOM'.
'causing' is the link.
(Other definitions for venom that I've seen before include "Poisonous liquid of snakes" , "Bitter malice" , "acrimony" , "Virulence" , "Virulent feeling" .)