Crossword Genius

Top removed from cleaning liquid for drain (5)

Ross

I believe the answer is:

leach

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'for drain' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for leach that I've seen before include "Filtrate" , "Drain away by percolation" , "Remove (soluble material) by percolation" , "Drain away through percolating liquid" , "Percolate - be removed by percolating liquid" .)

I've seen this clue in The Sun.
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