Earliest phase (5)
I believe the answer is:
onset
(Other definitions for onset that I've seen before include "Start - notes (anag)" , "Storming" , "Advent" , "Beginning (of something often unpleasant)" , "starting?" .)
I believe the answer is:
onset
(Other definitions for onset that I've seen before include "Start - notes (anag)" , "Storming" , "Advent" , "Beginning (of something often unpleasant)" , "starting?" .)