Fail utterly (2,4,3,3)
I believe the answer is:
go down the pan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fail utterly</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 go down the pan that I've seen before include "deteriorate rapidly" , "Fail utterly" .)