Artificial lake (9)
I believe the answer is:
reservoir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">artificial lake</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for reservoir that I've seen before include "Man-made lake of stored water" , "depot" , "Man-made lake to store water" , "Lake for collecting and storing water" , "Lake created to store water" .)