Have need of (7)
I believe the answer is:
require
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">have need of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for require that I've seen before include "Insist on" , "Want, demand" , ".. must have" , "Need" , "26 [ORDER]" .)