Formal address or discourse (6)
I believe the answer is:
speech
I believe this is a double definition.
'formal address' is the first definition.
(I've seen this in another clue)
'discourse' is the second definition.
(I know that discourse can be written as speech)
(Other definitions for speech that I've seen before include "Talking - language - oration" , "The spoken word" , "Talk given to an audience" , "Formal discourse to an audience" , "Vocal communication" .)