Accidentally (2,6)

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2,6

by chance

'accidentally' is the definition.
(synonyms)

This is all the clue.

(Other definitions for by chance that I've seen before include "unwittingly" , "Accidentally, not planned" , "Unplanned, as it happened" , "Without advance planning" , "Fortuitously" .)

I've seen this clue in The Times, the Sydney Morning Herald and The Mirror.

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