Necessity (4)
There are a few possibilities for this:
prerequisite
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">necessity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that need is a type of necessity)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for need that I've seen before include "A condition" , "Require (as essential)" , "Exigency" , "Lack - demand" , "'miss'" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">necessity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that must is a type of necessity)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for must that I've seen before include "The mould is compelled" , "Prerequisite" , "Unfermented wine" , "Smell of dampness or staleness" , "Is obliged to" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">necessity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for prerequisite that I've seen before include "Needed as a prior condition" , "Something required as a prior condition" , "Early qualification" .)