Nearly all nonsense, admitted intelligence report (8)
I believe the answer is:
bulletin
'intelligence report' is the definition.
'bulletin' can be an answer for 'report' (bulletin is a kind of report). I'm unsure of the 'intelligence' bit.
'nearly all nonsense admitted' is the wordplay.
'nearly all' means to remove the last letter (most but not all of the word).
'nonsense' becomes 'bull' (I've seen this before).
'admitted' becomes 'let in' (I've seen this in another clue).
'bull' with its last letter taken away is 'bul'.
'bul'+'letin'='BULLETIN'
Can you help me to learn more?
(Other definitions for bulletin that I've seen before include "Brief report issued to the public" , "Official news item" , "Report for publication or broadcast" , "News report" , "Regular report" .)