Crossword Genius

Last year's sr (4)

Ross

I believe the answer is:

alum

(Other definitions for alum that I've seen before include "Compound used in dyeing and to stop bleeding" , "Sulphate used in dyeing and tanning" , "Sulphate; maul (anag.)" , "Potassium compound; IoW sandy bay" , "Compound used in tanning and dying" .)

I've seen this clue in the LA Times and The New York Times.
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