Electrical fault (5,7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
short circuit
'electrical fault' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for short circuit that I've seen before include "Current malfunction" , "One may blow a fuse" , "Electrical problem" , "reason for fast lap times?" , "use more direct but irregular route" .)