Brat hasn't time to make mistake (5)
I believe the answer is:
Here is my best explanation:
'mistake' is the definition.
('error' can be a synonym of 'mistake')
'brat hasn't time' is the subsidiary indication.
'brat' becomes 'terror' ('terror' can be a synonym of 'brat').
'hasn't' is a deletion indicator.
'time' becomes 't'.
'terror' with 't' taken out is 'error'.
'to make' is the link.
(Other definitions for error that I've seen before include "Gaffe", "Boo-boo", "Blunder or mistake", "Blunder, slip", "Miscalculation", "Fallacy, mistake", "Inaccuracy", "Slip, blunder", "Slip, mistake" and "Solecism".)