TV signal carrier (5)
I believe the answer is:
cable
'tv signal carrier' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cable that I've seen before include "Communication - wire - 200 yards in length" , "Liberal Democrat" , "Strong suspension bridge made of wire" , "A message transmitted" , "Anchor chain; type of TV" .)