Crossword Genius

Beginning phase (5)

Ross

I believe the answer is:

onset

'beginning phase' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for onset that I've seen before include "Start - notes (anag)" , "Outbreak" , "Beginning; violent attack" , "Kick-off" , "Start, beginning" .)

I've seen this clue in the Universal, the LA Times, the Newsday, The New York Times and the USA Today.
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