Sudden and ignominious failure (7)
I believe the answer is:
debacle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden and ignominious failure</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 debacle that I've seen before include "Rout; fiasco" , "A sound defeat" , "Sudden and violent collapse" , "Utter failure" , "Sudden disastrous collapse or defeat" .)