Crossword Genius

Tearaway ultimately at fault (6)

Ross

I believe the answer is:

terror

'tearaway' is the definition.
(in the sense of a misbehaving child)

'ultimately at fault' is the wordplay.
'ultimately' indicates one should take the final letters.
'fault' becomes 'error' ('error' can be a synonym of 'fault').
The final letter of 'at' is 't'.
't'+'error'='TERROR'

(Other definitions for terror that I've seen before include "Extreme fear of dread" , "Young miscreant" , "Extreme fright or dread" , "Panicky fright" , "Troublesome child" .)

I've seen this clue in The Guardian.
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