Chance, coincidence (12)

I believe the answer is:

happenstance

I believe this clue is a double definition.

'chance' is the first definition.
(thesaurus)

'coincidence' is the second definition.
(I know that coincidence can be written as happenstance)

(Another definition for happenstance that I've seen is " Accident".)

I've seen this clue in The Times.

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