If you can hear it you don't read it (6)
I believe the answer is:
report
'it' is the definition.
The definition suggests a singular noun which matches the answer.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for report that I've seen before include "Bulletin" , "Make a complaint about (someone)" , "Complain about; noise" , "Pupil's assessment" , "Narrative given by porter" .)