Waters down (7)
I believe the answer is:
dilutes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">waters down</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 dilutes that I've seen before include "waters down" , "Thins by adding water" , "Weakens by adding more liquid" .)