Bond that promotes easy communication (7)
I believe the answer is:
rapport
'bond that promotes easy communication' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rapport that I've seen before include "Sympathetic relationship" , "Empathy" , "Harmonious relationship between two people" , "Pro rapt with fellow feeling" , "Bond of sympathy" .)