New rose hybrid is European (5)
I believe the answer is:
norse
'is european' is the definition.
(I've seen this before)
'new rose hybrid' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'hybrid' indicates anagramming the letters (a hybrid is a mixture).
'rose' with letters rearranged gives 'orse'.
'n'+'orse'='NORSE'
(Other definitions for norse that I've seen before include "Viking" , "Old Scandinavian tongue" , "Old form of Norwegian" , "Language - senor! (anag)" , "Northern European" .)