Grass-cutting implement (6)
I believe the answer is:
scythe
'grass-cutting implement' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for scythe that I've seen before include "Reaping blade" , "Old hands-wielded grass or crop cutter" , "Reaping implement" , "Harvesting tool" , "Crop cutting blade" .)