Volume of praise (6)
I believe the answer is:
hymnal
'volume' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'praise' is the wordplay.
I cannot quite understand how this works, but
'praise' could be 'hymn' (I've seen this before) and 'hymn' is located in the answer.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for hymnal that I've seen before include "Religious songbook" , "chorister's guide" , "Book of church songs" , "Book of verses expressing 20" , "Church song book" .)