Crossword Genius

"Double, double ___ and trouble" ("Macbeth" incantation) (4)

Ross

I believe the answer is:

toil

(Other definitions for toil that I've seen before include "Work incessantly" , "Work hard, labour" , "Hard physical work" , "Work hard and long" , "Work extremely hard" .)

I've seen this clue in The Washington Post.
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