European to study paradise (4)
I believe the answer is:
eden
'paradise' is the definition.
(Garden of Eden)
'european to study' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'to study' becomes 'den' (term for a study or office).
'e'+'den'='EDEN'
(Other definitions for eden that I've seen before include "Genesis garden" , "Adam and Eve's garden" , "Cornish garden; paradise" , "Adam and Eve's 19" , "The primal garden" .)