Show in advance (5)
I believe the answer is:
pilot
This could 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.
Perhaps you can see an association between them that I can't see?
'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" .)