Crossword Genius

Make turbulent (4)

Ross

I believe the answer is:

roil

'make turbulent' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Another definition for roil that I've seen is " Set up Rollers".)

I've seen this clue in The Washington Post Sunday, the Newsday, the USA Today, the Universal, the New York Times, the L.A. Times Daily and the Newsday.com.
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