Crossword Genius

Grad (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grad</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

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