Certain to succeed (4-4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">certain to succeed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sure-fire that I've seen before include "Certain of success" , "Dead cert" , "Infallible" , "Certain to succeed - a positive conflagration?" .)
(Other definitions for foolproof that I've seen before include "Not liable to failure" , "Not admitting failure" , "Certain" , "sure to work" , "Can't be misinterpreted, even by simpleton" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">certain to succeed</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 surefire that I've seen before include "Always effective" , "certain to succeed" .)