Polygraph (3,8)
I believe the answer is:
lie detector
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">polygraph</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lie detector that I've seen before include "Truth-finding machine" , "Editor elect (anag.)" , "Truth-determining device" , "Device helping find truth" , "that should tell stories?" .)