Aluminum product that sparks in the microwave (4)

I believe the answer is:

foil

(Other definitions for foil that I've seen before include "Prevent from succeeding" , "Thwart - contrasting thing - sword" , "Blunt sword with a button on the end" , "Prevent the success of; fencing sword" , "blunt weapon" .)

I've seen this clue in the USA Today.

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