Neat, undiluted (4)
I believe the answer is:
pure
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">neat</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(both can mean undiluted)</span><br/ ><br/ >'<span class="explanation-format__original">undiluted</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for pure that I've seen before include "Untainted" , "Undefiled" , "Virginal" , "Not mixed or adulterated" , "Not mixed with anything else" .)