Making certain (8)
I believe the answer is:
ensuring
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">making certain</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ensure' can be a synonym of 'make certain')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ensuring that I've seen before include "Making certain" , "Making safe" , "Maklng certain" .)