Look back inside light and push, connecting electrical device
I believe the answer is:
three pin plug
'look back inside light' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'push connecting electrical device' is the wordplay.
I cannot quite see how this works, but
'push' could be 'plug' (plugging is a kind of pushing) and 'plug' is found within the answer.
'device' could be 'pin' (pin is a kind of device) and 'pin' is found in the answer.
The remaining letters 'three' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Another definition for three pin plug that I've seen is " Device fitting into a socket".)