Thirst quencher
I believe the answer is:
water
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thirst quencher</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 water that I've seen before include "Diamond quality" , "H2O" , "something damp" , "Gem quality; fluid" , "Essential liquid" .)