Crossword Genius

First appearance (5)

Ross

I think it could be either:

debut

onset

'first appearance' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for onset that I've seen before include "Stone (anag)" , "Initial stage; attack" , "Appearance of" , "Start, beginning" , "Assault; beginning" .)

I've seen this clue in The Sun, The Guardian, the Sydney Morning Herald, The Independent, The Mirror, the Evening Standard, the USA Today, The Times and the Penny Press.
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