Complete disaster (6)
I believe the answer is:
fiasco
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">complete disaster</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fiasco that I've seen before include "Abject failure" , "Debacle, a right mess" , "A ludicrous failure, a shambles" , "Total debacle" , "bomb" .)