Something to read in church? (5)

I believe the answer is:
banns
'read in church?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for banns that I've seen before include "Proclamation of intended marriage" , "Notice of a wedding" , "Pre-wedding notice" , "Public announcement read in church of forthcoming marriage" , "Notices of marriage" .)
