Fear taking time off is wrong (5)
I believe the answer is:
error
'is wrong' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for error that I've seen before include "Boob" , "Mistake or mishap" , "Solecism" , "A mistake or inaccuracy" , "Blunder, slip" .)