Scornful criticisms from a sister (7)
I believe the answer is:
satires
'scornful criticisms' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Maybe you can see a link between them that I can't see?
'from a sister' is the wordplay.
'from' indicates an anagram (the anagram comes from the same letters).
'a'+'sister'='asister'
'asister' anagrammed gives 'SATIRES'.
Can you help me to learn more?
(Other definitions for satires that I've seen before include "travesties?" , "A sister (anag.)" .)