Drain away through percolation (5)

I believe the answer is:

leach

(Other definitions for leach that I've seen before include "Remove (soluble material) by percolation" , "Filtrate" , "Make liquid percolate through a solid" , "Make liquid percolate through soil" , "Drain away through percolating liquid" .)

I've seen this clue in The Wall Street Journal.

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