Psst? Real problem with church collections! (8)
I believe the answer is:
Here is my best explanation:
'church collections' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps you can see an association between them that I can't see?
'psst? real problem' is the subsidiary indication.
'problem' indicates an anagram.
'psstreal' with letters rearranged gives 'psalters'.
'with' is the link.
(Other definitions for psalters that I've seen before include "Books of Psalms", "Books of psalms", "Versions of the Book of Psalms", "liturgical books" and "religious books".)