Crossword Genius

One of two standard Soviet tools (6)

Ross

I believe the answer is:

sickle

I'm a little stuck... Click here to teach me more about this clue!

'one of two standard' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sickle that I've seen before include "Crescent-shaped hand tool for cutting corn" , "Tool for cutting grain" , "field-worker being a trimmer" , "Grass-cutting implement" , "Tool for cutting grass or crops" .)

I've seen this clue in The Globe and Mail.
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