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Passes over and reverts as otherwise specified (9)

Ross

I believe the answer is:

traverses

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

'passes over' is the definition.
('traverse' can be a synonym of 'pass over')

'reverts as otherwise specified' is the wordplay.
'reverts as' can be anagrammed to 'TRAVERSES'.
Though, I'm unsure how this is indicated.

'and' is the link.

Can you help me to learn more?

(Another definition for traverses that I've seen is " crosses".)

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