False or incorrect (6)
I believe the answer is:
untrue
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">false</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that false can be written as untrue)</span><br/ ><br/ >'<span class="explanation-format__original">incorrect</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for untrue that I've seen before include "Not in accordance with fact" , "Wrong" , "like the magnetic north?" , "Not faithful" , "Spurious" .)