Pronouncing the sibilant in "epigrams" (7)
I believe the answer is:
sayings
'epigrams' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'pronouncing the sibilant' is the wordplay.
'pronouncing' becomes 'saying' ('say' can be a synonym of 'pronounce').
'the sibilant' becomes 's' (this might be a standard abbreviation which I don't know about).
'saying'+'s'='SAYINGS'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sayings that I've seen before include "Maxims, adages" , "Comments" .)