Crossword Genius

Water rate? (4)

Ross

I believe the answer is:

knot

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

This clue might be a double definition.

'water' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'rate?' is the second definition.

Can you help me to learn more?

(Other definitions for knot that I've seen before include "Small northern sandpiper" , "Small cluster - huddled group - sheepshank, for example" , "Tie (or what is put in one?)" , "Granny or reef, perhaps?" , "Fastening formed by tying string etc" .)

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