Swirl, whirl (4)
I believe the answer is:
eddy
I believe this clue is a double definition.
'swirl' is the first definition.
(synonyms)
'whirl' is the second definition.
(synonyms)
(Other definitions for eddy that I've seen before include "religious leader" , "movement going round in circles" , "Turner at sea" , "current running back" , "Spin" .)