Be in want of (4)
I believe the answer is:
need
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be in want of</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 need that I've seen before include "Call" , "Necessitate" , "Require (as essential)" , "state requiring relief" , "Cry out for - prerequisite" .)