Inbuilt (8)
I believe the answer is:
inherent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inbuilt</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inherent that I've seen before include "Necessary as a part" , "deep-rooted" , "Existing permanently in something" , "Inborn or intrinsic" , "Basic" .)