Russian liquor (5)
I believe the answer is:
vodka
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian liquor</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 vodka that I've seen before include "Colourless alcohol" , "Russian "little water"" , "Russian liquor" , "Colourless alcoholic spirit associated with Russia" , "Distilled spirit" .)