Crossword Genius

Grad (4)

Ross

I believe the answer is:

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

This is the entire 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 New York Times, the Universal, the Newsday, The Wall Street Journal, the LA Times, the King Feature Syndicate, the USA Today, The Washington Post and the Penny Press.
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