Fancy a tenor badly (6)
I believe the answer is:
ornate
'fancy' is the definition.
(I've seen this before)
'a tenor badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'a'+'tenor'='atenor'
'atenor' anagrammed gives 'ORNATE'.
(Other definitions for ornate that I've seen before include "Rococo" , "Over-elaborate" , "Much-decorated" , "Fancy" , "Decorated with tan ore" .)