Whirling waters (6)
I believe the answer is:
eddies
'whirling waters' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eddies that I've seen before include "The flow in a circular current" , "Miniature whirlpools" , "goes down the plughole" , "Flows in a circular current" , "They flow against the main stream" .)