Quick way to switch off after electrical problem (8)
I believe the answer is:
shortcut
'quick way' is the definition.
'switch off after electrical problem' is the wordplay.
'switch off' becomes 'cut' ('cut' can be a synonym of 'switch off').
'after' says to put letters next to each other.
'electrical problem' becomes 'short'.
'cut' after 'short' is 'SHORTCUT'.
'to' acts as a link.
(Other definitions for shortcut that I've seen before include "quicker way" , "Quicker route" , "more direct route" , "way to save time" , "route for saving time" .)