Rum and water (4)

I believe the answer is:
grog
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rum and water</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for grog that I've seen before include "Old sailors' tipple" , "The old sailor's tradition drink" , "Drink of spirits mixed with water" , "Mixture of spirit and water" , "Sailors' drink of rum and water" .)