Percolate through (5)
I believe the answer is:
leach
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">percolate through</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for leach that I've seen before include "Drain away through percolating liquid" , "Percolate - be removed by percolating liquid" , "Drain away by percolation" , "Make liquid percolate through soil" , "Percolate through soil or ore" .)