Well-informed (13)
I believe the answer is:
knowledgeable
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">well-informed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for knowledgeable that I've seen before include "Well informed" , "Conversant" , "Savvy" , "Intelligent and well-informed" , "Erudite" .)