Powerful circular current (6)

I believe the answer is:

vortex

'powerful circular current' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for vortex that I've seen before include "Powerful circular current of water" , "Whirlpool current" , "Whirling fluid" , "Whirling motion" , "Engulfing swirl of e.g. whirlpool" .)

I've seen this clue in the Irish Times (Simplex) and The Guardian.

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