Crossword Genius

First phase (5)

Ross

I believe the answer is:

onset

'first 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 "Assault; beginning" , "origin" , "Start - notes (anag)" , "Beginning or early stages" , "Assault; start" .)

I've seen this clue in the Newsday.
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