Fancy a tenor being badly prepared (6)
I believe the answer is:
ornate
'fancy' is the definition.
(thesaurus)
'a tenor being badly prepared' is the wordplay.
'being badly prepared' indicates anagramming the letters (I've seen this in other clues).
'a'+'tenor'='atenor'
'atenor' with letters rearranged gives 'ORNATE'.
(Other definitions for ornate that I've seen before include "Rich in decorative detail" , "Are not (anag.)" , "Richly decorative" , "Florid" , "Richly adorned and elaborate" .)