Untainted (4)
I believe the answer is:
pure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">untainted</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 pure that I've seen before include "Innocent; unsullied" , "Chaste" , "Nothing but; innocent" , "free of bad grammar" , "Innocent, uncontaminated" .)