Threshing implement (5)

I believe the answer is:
flail
'threshing implement' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for flail that I've seen before include "Weapon; swing wildly" , "Wave about wildly" , "Threshing implement" , "Grain thresher" , "Thresh about" .)