Electrical outlet (6)
I believe the answer is:
socket
'electrical outlet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for socket that I've seen before include "Cavity for a plug" , "Hollow for a ball or plug" , "An electric plug fits into it" , "Receptacle where something is inserted" , "Plug receiver" .)