Crossword Genius

Soapmaking substance (3)

Ross

I believe the answer is:

lye

'soapmaking substance' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lye that I've seen before include "Solution obtained by leaching" , "solution that comes out in the wash?" , "Alkaline liquid" , "Branch railway" , "Alkaline solution used for washing" .)

I've seen this clue in the Universal.
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