In the centre of Bern, Carole sourced slip (5)

I believe the answer is:

error

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'slip' is the definition.
(slip can mean an error or mistake)

I cannot understand how the rest of the clue works.

(Other definitions for error that I've seen before include "Boob" , "Blunder, slip" , "Blunder or mistake" , "Mistake, lapse" , "heresy" .)

I've seen this clue in The Irish Times.

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