Elaborate or terribly neat (6)
I believe the answer is:
ornate
'elaborate' is the definition.
(I've seen this before)
'or terribly neat' is the wordplay.
'terribly' indicates anagramming the letters.
'neat' anagrammed gives 'nate'.
'or'+'nate'='ORNATE'
(Other definitions for ornate that I've seen before include "Elaborately decorated, perhaps overdone" , "(Of literary style) complex and with unusual words" , "Highly decorative" , "Fancy" , "Are not (anag.)" .)