Nice show of friendliness, encouraging you to go! (3,6)
I believe the answer is:
bon voyage
'nice show' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'of friendliness encouraging you to go' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is present in the answer.
'you' could be 'ya' (non-standard spelling as in 'see ya later') and 'ya' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bon voyage that I've seen before include "Have a nice cruise, monsieur" , "travel well!" , "Have a good trip - on the briny" , "Have a good journey - at sea" .)