Whirling water (6)

I believe the answer is:

vortex

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

I've seen this clue in the Newsday.

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