Unconvincing sort of reasoning by judges in official bulletin (5,8)
I believe the answer is:
court circular
'bulletin' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for court circular that I've seen before include "report of royals" , "Report of royal activities" , "list of engagements" .)