Swing wildly (5)
I believe the answer is:
flail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swing wildly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for flail that I've seen before include "Thresher; wave helplessly about" , "thrash around" , "Wave about wildly" , "Old tool for threshing grain" , "Threshing implement" .)