Reverend's mistake: lovey-dovey type is married (10)
I believe the answer is:
spoonerism
'reverend's mistake' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'lovey-dovey type is married' is the wordplay.
'lovey-dovey type' becomes 'spooner' (I am not sure about this - if you are sure you should believe this answer much more).
'married' becomes 'm'.
'spooner'+'is'+'m'='SPOONERISM'
Can you help me to learn more?
(Other definitions for spoonerism that I've seen before include "occasional cluing technique" , ""A lopping of sweaters", for example" , "Regular announcement by old clergyman" , "Burly chassis for Shirley Bassey, say?" , "Verbal exchange of leading characters" .)