Crossword Genius

Found out emigration drove out millions (9)

Ross

I believe the answer is:

originate

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

I don't understand the remainder of the clue.

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(Other definitions for originate that I've seen before include "Launch" , "Stem" , "Create; begin" , "Cause to begin, be the first" , "Come into existence" .)

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