Drain cleaner chemical (3)

I believe the answer is:

lye

'drain cleaner chemical' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for lye that I've seen before include "caustic liquid" , "Solution obtained by leaching" , "Alkali washing solution" , "Alkaline solution used for washing" , "Branch railway" .)

I've seen this clue in the Newsday.com and the Newsday.

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