Fancy spout round back of urn (6)
I believe the answer is:
ornate
'fancy' is the definition.
(thesaurus)
'spout round back of urn' is the wordplay.
'spout' becomes 'orate' (I've seen this before).
'round' is an insertion indicator.
'back of urn' becomes 'n' (I can't explain this - if you can you should believe this answer much more).
'orate' going around 'n' is 'ORNATE'.
Can you help me to learn more?
(Other definitions for ornate that I've seen before include "(Of literary style) complex and with unusual words" , "Are not (anag.)" , "Detailed" , "Richly decorative" , "Highly decorative" .)