First appearance (5)

I think it could be either:

debut

onset

'first appearance' is the definition.
(synonyms)

This is all the clue.

(Other definitions for debut that I've seen before include "First appearance in society" , "Initial appearance" , "First attempt" , "Start -- launch" , "where one began" .)

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

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