Fear wiping out's terminal blunder (5)
I believe the answer is:
error
'blunder' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for error that I've seen before include "Boo-boo" , "A mistake or inaccuracy" , "Way of operating" , "Trial and ___" , "Miscarriage of justice" .)