Not reliable (13)
I believe the answer is:
untrustworthy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not reliable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for untrustworthy that I've seen before include "Not reliable" , "Not to be believed" , "Not to be relied upon" .)