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 USA Today, the Sydney Morning Herald, The Sun, the Evening Standard, The Independent, The Telegraph, The Times, the Penny Press, The Guardian and The Mirror.
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