Come to nothing (2,2,2,5)
I think it could be either:
go up in smoke
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">come to nothing</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 up in smoke that I've seen before include "Be destroyed by fire" , "vanish" , "Arsonist's deed may" , "be wasted" , "Come to nothing (like a cigarette?)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">come to nothing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for fall through that I've seen is " Don't succeed (when crossing thin ice?)".)