Channel midway (6)
I believe the answer is:
medium
I believe this is a double definition.
'channel' is the first definition.
(I've seen this before)
'midway' is the second definition.
(thesaurus)
(Other definitions for medium that I've seen before include "Neither big nor small" , "Spirits of dead people are said to communicate through one" , "Middle course for spiritualists" , "Intermediary with the spirit world" , "Intermediary between the living and the dead" .)