Large pond (4)
I believe the answer is:
lake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large pond</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lake that I've seen before include "Pool" , "holiday up north" , "A pigment; a body of water" , "Purplish-red pigment" , "Superior maybe < that's red" .)