Religious advice to be soundly followed (5)
I believe the answer is:
tract
'religious advice' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'soundly followed' is the wordplay.
'soundly' shows a homophone (sound like).
'followed' becomes 'tracked' (to track is to follow or tail).
'tracked' sounds like 'TRACT'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for tract that I've seen before include "anthem" , "Lots of land" , "Extended area of land" , "Pamphlet, large expanse of land" , "Large area; treatise" .)