Part with not a word about what happened (7)
I believe the answer is:
seventh
'part' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'not a word about what happened' is the wordplay.
'not a word' becomes 'sh'.
'about' is an insertion indicator.
'what happened' becomes 'event' (I've seen this in another clue).
'sh' going around 'event' is 'SEVENTH'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for seventh that I've seen before include "This heaven is the most exalted state of happiness" , "In this heaven, one is ecstatic" , "This son of another is said to be a healer" , "Position of Judges in Old Testament" , "after six" .)