Many a univ. donor (4)

I believe the answer is:

alum

(Other definitions for alum that I've seen before include "White mineral salt used in medicine and in dyeing" , "Potassium compound; IoW sandy bay" , "Compound used in tanning and dying" , "double sulphate" , "Name given to a specific chemical compound and a class of them" .)

I've seen this clue in the USA Today, the LA Times and the Universal.

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