A day in European city (Spain) - bliss (8)
I believe the answer is:
paradise
'bliss' is the definition.
(I've seen this in another clue)
'a day in european city spain' is the wordplay.
'day' becomes 'd' (abbreviation for day).
'in' indicates putting letters inside.
'european city' becomes 'paris' (capital of France).
'spain' becomes 'e' (abbreviation for Espana).
'a'+'d'='ad'
'ad' inserted inside 'paris' is 'paradis'.
'paradis'+'e'='PARADISE'
(Other definitions for paradise that I've seen before include "Eden; ideal place" , "Persian word which in Hebrew became 'a blessed place'" , "Felicity" , "perfectly happy state" , "Idyllic place" .)