Crossword Genius

Grad (4)

Ross

I believe the answer is:

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

This is all the clue.

(Other definitions for alum that I've seen before include "Sulphate; maul (anag.)" , "Aluminium/potassium sulphate" , "Colourless compound used in dyeing and tanning" , "Name given to a specific chemical compound and a class of them" , "Potassium compound; IoW sandy bay" .)

I've seen this clue in the LA Times, the Newsday, the Penny Press, the Universal, The New York Times, The Washington Post, the USA Today, The Wall Street Journal and the King Feature Syndicate.
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