Treat similar to a milkshake (4)

I believe the answer is:

malt

(Other definitions for malt that I've seen before include "Grain prepared for brewing or distilling" , "Dried grain used for brewing and distilling" , "Germinated and kiln-dried grain used in brewing and distilling" , "Brewing agent" , "Barley product used in brewing" .)

I've seen this clue in the USA Today.

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