Crossword Genius

Panic after leader’s departure? That’s a mistake (5)

Ross

I believe the answer is:

error

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'that's a mistake' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for error that I've seen before include "Solecism" , "Miscalculation" , "Boob" , "heresy" , "Slip-up" .)

I've seen this clue in The Times.
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