Report (7)
'report' is the definition.
(report can mean a loud noise)
This is all the clue.
(Other definitions for bang that I've seen before include "hit" , "Straight fringe of hair" , "Sudden loud noise like an explosion" , "Slam" , "drug injection" .)
'report' is the definition.
(I know that bulletin is a type of report)
This is all the clue.
(Other definitions for bulletin that I've seen before include "Short statement on the news as it happens" , "Regular newsletter" , "Short and regular up-date" , "Broadcast summary of news" , "Short official statement of news" .)
'report' is the definition.
(I know that report can be written as account)
This is the entire clue.
(Other definitions for account that I've seen before include "Explanation of conduct" , "Report of an event" , "Invoice - story" , "Record of an event" , "Charge" .)