Crossword Genius

Waterway splitter? (5)

Ross

I believe the answer is:

river

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'waterway' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for river that I've seen before include "Current" , "x or y, so to speak" , "Thames is one" , "eg Aire" , "Such as the Nile or Amazon" .)

I've seen this clue in the Sydney Morning Herald.
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