Complete disaster as coif is bungled (6)
I believe the answer is:
fiasco
'complete disaster' is the definition.
(I've seen this in another clue)
'as coif is bungled' is the wordplay.
'is bungled' is an anagram indicator.
'as'+'coif'='ascoif'
'ascoif' anagrammed gives 'FIASCO'.
(Other definitions for fiasco that I've seen before include "Utter failure, debacle" , "Abject failure" , "Total catastrophe" , "Total cock-up" , "Debacle, a right mess" .)