It's a mistake losing the head with local rascal (5)

I believe the answer is:

error

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'it's a mistake' is the definition.
('error' can be a synonym of 'mistake')

I can't explain the remainder of the clue.

(Other definitions for error that I've seen before include "Mistake, lapse" , "Slip-up" , "Mistake or fault" , "Mistake from terrorist" , "Way of operating" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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