Fear taking time off is wrong (5)

I believe the answer is:

error

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'is wrong' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for error that I've seen before include "Boob" , "Mistake or mishap" , "Solecism" , "A mistake or inaccuracy" , "Blunder, slip" .)

I've seen this clue in the Evening Standard.

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