Annoys Sweden to no purpose (8)
I believe the answer is:
needless
'no purpose' is the definition.
'annoys sweden' is the wordplay.
'annoys' becomes 'needles' (I've seen this before).
'sweden' becomes 's'.
'needles'+'s'='NEEDLESS'
'to' is the link.
(Other definitions for needless that I've seen before include "- - to say" , "for no good reason" , "Excessive" , "Unneccessary and unwarranted" , "Otiose" .)