Marry odd European, eccentric creature (9)
I believe the answer is:
dromedary
'creature' is the definition.
(I've seen this before)
'marry odd european eccentric' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'eccentric' indicates anagramming the letters.
'marry'+'odd'+'e'='marryodde'
'marryodde' is an anagram of 'DROMEDARY'.
(Other definitions for dromedary that I've seen before include "Animal" , "Desert traveller" , "Arab racer" , "Kind of camel" , "desert transport" .)