Invalid (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">invalid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for void that I've seen before include "Empty or vacant, like space" , "Emptiness, empty space" , "Containing nothing or not legally binding" , "Blank, invalid" , "Empty space or vacuum" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">invalid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for null that I've seen before include "Of no effect, value" , "Legally void" , "Invalid; empty" , "Without legal force" , "Without force, validity" .)