Crossword Genius

Seth leaves theorising to Dawn? (6)

Ross

I believe the answer is:

origin

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'dawn?' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for origin that I've seen before include "Genesis" , "First thing" , "Square one" , "Source, beginning point" , "Source - provenance" .)

I've seen this clue in the Irish Times.
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