Unmixed (4)
I believe the answer is:
pure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unmixed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pure that I've seen before include "free of contaminants" , "Chaste" , "Untainted" , "Innocent, uncontaminated" , "Undefiled" .)