Mass of whirling fluid or air (6)

I believe the answer is:

vortex

(Other definitions for vortex that I've seen before include "Eddy" , "Whirling mass of wind or water" , "Engulfing swirl of e.g. whirlpool" , "Spinning mass of water or air" , "Whirlpool or swirling mass" .)

I've seen this clue in the USA Today.

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