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