Crossword Genius

Caustic solution (3)

Ross

I believe the answer is:

lye

'caustic solution' 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 "Alkaline solution used for washing" , "Solution obtained by leaching" , "Strong alkaline solution" , "Strongly alkaline wash" , "Alkali washing solution" .)

I've seen this clue in the LA Times, the Sydney Morning Herald, the King Feature Syndicate, The New York Times and The Independent.
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