An old-fashioned cutter (6)
I believe the answer is:
scythe
This clue could be a double definition.
'an old-fashioned' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'cutter' is the second definition.
(scythe is a kind of cutter)
Can you help me to learn more?
(Other definitions for scythe that I've seen before include "Crop-cutting tool" , "Edge tool" , "Cut down - grass-cutting implement" , "what the reaper holds" , "Crop cutting blade" .)