Stress about identity? It happens (8)

I believe the answer is:

accident

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'it happens' is the definition.
The definition suggests a singular noun which matches the answer.

'stress about identity?' is the wordplay.
'stress' becomes 'accent' (accent can mean to emphasise or stress).
'about' is an insertion indicator.
'identity?' becomes 'id' (abbreviation).
'accent' placed around 'id' is 'ACCIDENT'.

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(Other definitions for accident that I've seen before include "Mishap, misadventure" , "Pile-up" , "Unfortunate unintentional incident" , "tragedy?" , "Calamity" .)

I've seen this clue in The Sun.

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