Approach station guide (7)
I believe the answer is:
channel
I believe this is a triple definition!
'approach' is the first definition.
(thesaurus)
'station' is the second definition.
(TV channel)
'guide' is the third definition.
(I know that channel is a kind of guide)
(Other definitions for channel that I've seen before include "Medium of transmission" , "Conduit, duct" , "water-bed" , "Groove" , "Means of passage or communication" .)