Show in advance (5)
I believe the answer is:
pilot
This clue might be a double definition.
'show' is the first definition.
(pilot is a kind of show)
'advance' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'in' acts as a link.
Can you help me to learn more?
(Other definitions for pilot that I've seen before include "Steer (a ship or plane)" , "-- Whale; -- light" , "Flier or helmsman" , "trial episode" , "Airman" .)