Crossword Genius

Reaper, gutless: sarcastic, yet handsome (6)

Ross

I believe the answer is:

scythe

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'reaper' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scythe that I've seen before include "Manual hay-cutter wielded with both hands" , "Manual tool of reaper" , "Grass-cutting tool" , "Large sickle" , "It's useful for hacking" .)

I've seen this clue in The Times.
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