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