Crossword Genius

In the main it's the going rate (5)

Ross

I believe the answer is:

knots

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'rate' is the definition.
(knots is a kind of rate)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for knots that I've seen before include "Looped fastenings" , "Nautical mph" , "They secure" , "Tangles" , "the going rate, in the main" .)

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