Not having been told there's no electricity laid on? (2,3,4)
I believe the answer is:
in the dark
'been told there's no electricity laid on?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'not' is the wordplay.
I cannot really understand how this works, but
'not' could be 'nt' (synonyms) and 'nt' is located in the answer.
This explanation may well be incorrect...
'having' is the link.
Can you help me to learn more?
(Other definitions for in the dark that I've seen before include "without being informed" , "Lacking information" , "overnight" , "without being told" , "after sundown" .)