Happen to go round Sweden (5)
I believe the answer is:
exist
'happen' is the definition.
(thesaurus)
'go round sweden' is the wordplay.
'go' becomes 'exit' ('exit' can be a synonym of 'go'**).
'round' indicates putting letters inside.
'sweden' becomes 's'.
'exit' going around 's' is 'EXIST'.
'to' acts as a link.
(Other definitions for exist that I've seen before include "Survive" , "Get a life!" , "Scrape by" , "Live" , "quick!" .)