Swirl (4)
I believe the answer is:
eddy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swirl</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eddy that I've seen before include "movement going round in circles" , "She founded Christian Science in 1866, d. 1910" , "Christian Scientist" , "Current running against the main stream, causes small whirlpool" , "dangerous bit of water" .)