Sadly, I'm doubter about one court making a passing comment (6)
'passing comment' is the definition.
'obiter' can be an answer for 'passing' (legal term meaning said in passing). I'm not certain of the 'comment' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for obiter that I've seen before include "In passing" , "By the way (Latin)" , "Incidental remark in Latin - . . . . . . dictum" , "incidentally" , "..... dictum means any incidental remark" .)
'a passing comment' is the definition.
(something said in passing by a judge)
'sadly i'm doubter about one court' is the wordplay.
'sadly' indicates an anagram.
'about' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'court' becomes 'ct' (abbreviation used in road names).
'im'+'doubter'='imdoubter'
'imdoubter' with letters rearranged gives 'obiterdum'.
'i'+'ct'='ict'
'obiterdum' placed around 'ict' is 'OBITER DICTUM'.
'making' is the link.
(Another definition for obiter dictum that I've seen is " Judge's side comment (Latin) - dim but erotic (anag)".)