Having knowledge (of) (5)
I believe the answer is:
aware
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">having knowledge of</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 aware that I've seen before include "Acquainted with or mindful of" , "Conscious, knowing about" , "Apprised or informed" , "Acquainted with or conscious of" , "Informed; conscious" .)