Unstudied (7)
I believe the answer is:
natural
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unstudied</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for natural that I've seen before include "lacking sophistication" , "Unaffected - native" , "Unaffected; off-white" , "Inborn, normal ( 7)" , "Inherent" .)