Eddy, whirl (5)
I believe the answer is:
swirl
I believe this clue is a double definition.
'eddy' is the first definition.
(I know that eddy can be written as swirl)
'whirl' is the second definition.
(I know that swirl is a action)
(Other definitions for swirl that I've seen before include "Whirl, twirl, curl" , "Eddy, whirl" , "Turn in a twisting or spinning motion; eddy" .)