Grass-cutting tool (6)
(Other definitions for sickle that I've seen before include "Reaping implement" , "Farmer's tool" , "Corn-cutting tool" , "Reaping-hook" , "With a hammer, it forms a Communist symbol" .)
'grass-cutting tool' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scythe that I've seen before include "Reaper's cutter" , "Old-fashioned hand-held hay mower" , "Implement with curved blade" , "Bladed mowing tool" , "Reaping implement" .)