Girl primarily broadcasting false information (3)
I believe the answer is:
fib
'false information' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'girl primarily broadcasting' is the wordplay.
'girl' becomes 'fi' (nickname for Fiona).
'primarily' indicates taking the first letters.
The first letter of 'broadcasting' is 'b'.
'fi'+'b'='FIB'
Can you help me to learn more?
(Other definitions for fib that I've seen before include "Story" , "minor piece of fiction" , "One must be 20 [UNTRUE]" , "Petty falsehood" , "Small lie" .)