Crossword Genius

Great fear of losing head in mistake (5)

Ross

I believe the answer is:

error

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'mistake' is the definition.
(I know that mistake can be written as error)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for error that I've seen before include "Slip-up" , "Miscalculation" , "Boo-boo" , "Faulty judgment" , "Fallacy, mistake" .)

I've seen this clue in The Irish News.
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