Crossword Genius

Version in which stream flows northward (4)

Ross

I believe the answer is:

edit

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If this is the answer I cannot explain how the clue works.

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(Other definitions for edit that I've seen before include "amend copy" , "Manage a newspaper" , "Adjust text" , "Make changes to (text)" , "Change text" .)

I've seen this clue in The Sun.
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