Noisy rumour (6)
I believe the answer is:
report
'rumour' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for report that I've seen before include "Sharp sound of a gun firing" , "Spoken/written account" , "Account; loud noise" , "result of firing?" , "Formal account of a matter" .)