Part of verse concerns yew, say, circling round church (7)
I believe the answer is:
trochee
'part of verse concerns' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'yew say circling round church' is the wordplay.
'yew say' becomes 'tree' (yew is a type of tree).
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'round' becomes 'o' (o is a circular letter).
'church' becomes 'ch' (common abbreviation).
'o'+'ch'='och'
'tree' enclosing 'och' is 'TROCHEE'.
Can you help me to learn more?
(Other definitions for trochee that I've seen before include "A foot of two syllables, long then short" , "poetic feature" , "Long-short foot in poetry" , "Foot of a stressed and an unstressed syllable" , "Metric foot; to cheer (anag.)" .)