Embellished or terribly neat (6)
I believe the answer is:
ornate
'embellished' is the definition.
(synonyms)
'or terribly neat' is the wordplay.
'terribly' indicates an anagram.
'neat' with letters rearranged gives 'nate'.
'or'+'nate'='ORNATE'
(Other definitions for ornate that I've seen before include "Decorated with tan ore" , "Heavily decorated" , "Much-decorated" , "Baroque" , "Elaborately decorated, perhaps overdone" .)