Watered-down rum (4)
I believe the answer is:
grog
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">watered-down rum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for grog that I've seen before include "Rum mixed with water" , "Traditional naval drink" , "Mixture of spirit and water" , "Sailors' drink of rum and water" , "Drink of spirits and water liked by sailors" .)