Turned so arctic - that's initially revealing (8)
I believe the answer is:
acrostic
'revealing' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'turned so arctic that's initially' is the wordplay.
'turned' indicates anagramming the letters.
'that's initially' is a charade indicator (letters next to each other).
'so' after 'arctic' is 'arcticso'.
'arcticso' anagrammed gives 'ACROSTIC'.
Can you help me to learn more?
(Other definitions for acrostic that I've seen before include "Legal document" , "code?" , "Puzzle spelling out something with first letters" , "Socratic sort of word puzzle" , "Form of word puzzle" .)