Crop-cutting blade (6)
I believe the answer is:
scythe
'crop-cutting blade' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scythe that I've seen before include "Grain-cutting tool" , "Old grass cutter with long handle and curved blade" , "Old farming tool" , "Implement with curved blade" , "Cropping instrument" .)