Warranty (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">warranty</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that warranty can be written as guarantee)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for guarantee that I've seen before include "Formal assurance" , "Provide financial security for" , "Undertake" , "security system" , "Something ensuring a particular outcome" .)
(Other definitions for lifetime that I've seen before include "Seemingly an age?" , "Period from the cradle to the grave" , "Human span" , "Years" , "From birth to death" .)