Crossword Genius

Row northwards, river dwellers -- but river goes west (3-2)

Ross

I believe the answer is:

set to

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for set to that I've seen before include "Fight, argument" , "Row" , "Altercation" , "Spat" , "Get cracking; start fighting" .)

I've seen this clue in The Telegraph.
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