Crossword Genius

Meandering line by waterway (4)

Ross

I believe the answer is:

nile

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

'waterway' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'meandering line' is the wordplay.
'meandering' indicates anagramming the letters.
'line' is an anagram of 'NILE'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for nile that I've seen before include "White or Blue river of Africa" , "River associated with Cleopatra" , "white flower?" , "'The longest river, blue and white (4)'" , "Take a line to the river" .)

I've seen this clue in The Mirror.
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