Former nurse welcoming day in country (6)
I believe the answer is:
sweden
'country' is the definition.
(country in Europe)
'former nurse welcoming day' is the wordplay.
'former nurse' becomes 'SEN' (state registered nurse - former UK nurse title).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'day' becomes 'wed' (abbreviation for Wednesday).
'sen' going around 'wed' is 'SWEDEN'.
'in' is the link.
(Other definitions for sweden that I've seen before include "4's neighbour" , "ditto" , "North European country" , "Its capital's Stockholm" , "Stockholm is the capital" .)