Cast to repeat light-hearted theatrical production (8)
I believe the answer is:
operetta
'light-hearted theatrical production' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'cast to repeat' is the wordplay.
'cast' is an anagram indicator (letters are dispersed or cast around).
'to'+'repeat'='torepeat'
'torepeat' anagrammed gives 'OPERETTA'.
Can you help me to learn more?
(Other definitions for operetta that I've seen before include "light-hearted performance" , "La belle Helene, say" , "Light musical theatre" , "G&S production, perhaps" , "work of note" .)