Cut it and keep quiet (6)
I believe the answer is:
cackle
This clue could be a double definition.
'cut' is the first 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?
'it and keep quiet' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for cackle that I've seen before include "Loud laugh, like a witch perhaps" , "Sound of a hen after laying an egg" , "Unpleasant laugh" , "Goose talk (sometimes cut)" , "Loud laugh, like a hen" .)