Add water (7)
I believe the answer is:
hydrate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">add water</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 hydrate that I've seen before include "Moisturise" , "Cause (something) to absorb water" , "Thready (anag.)" , "Apply water" , "Give water" .)