All-points bulletin (4)
I believe the answer is:
news
'bulletin' is the definition.
(news bulletin is a kind of bulletin)
'all-points' is the wordplay.
'all' becomes 'ne' (I am not sure about this - if you are sure you should believe this answer much more).
'points' becomes 'Ws' (W is an example).
'ne'+'ws'='NEWS'
Can you help me to learn more?
(Other definitions for news that I've seen before include "This is compiled for one" , "Hitherto unknown info" , "that's aired at six o'clock" , "Important information" , "Noteworthy information" .)