Error; false move (7)
I believe the answer is:
misstep
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">error</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(misstep can mean an error or mistake)</span><br/ ><br/ >'<span class="explanation-format__original">false move</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for misstep that I've seen before include "Badly judged move" , "bad move" , "Badly judged footing" , "Error" , "False move" .)