Sapient (4)
I believe the answer is:
wise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sapient</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wise that I've seen before include "comedian" , "Clever" , "Old way" , "Old and knowledgable" , "Sapient" .)