Denies CID's disrupted protest (10)
I believe the answer is:
dissidence
'protest' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'denies cid's disrupted' is the wordplay.
'disrupted' indicates an anagram.
'denies'+'cids'='deniescids'
'deniescids' anagrammed gives 'DISSIDENCE'.
Can you help me to learn more?
(Another definition for dissidence that I've seen is " Opposition to officialdom".)