Vital Kremlin embraces dialogue (4)
I believe the answer is:
talk
'dialogue' is the definition.
(I've seen this in another clue)
'vital kremlin embraces' is the wordplay.
'embraces' indicates a hidden word (I've seen 'embracing' mean this (the solution is embraced by words in the clue)).
'TALK' is hidden within 'vital kremlin'.
(Other definitions for talk that I've seen before include "Discourse" , "Utter" , "Converse" , "Chatter" , "Communicate" .)