Court hearing accepts main point upon reflection (8)
I believe the answer is:
tribunal
'court' is the definition.
(synonyms)
'hearing accepts main point upon reflection' is the wordplay.
'hearing' becomes 'trial' (as in a court case).
'accepts' is an insertion indicator.
'main point' becomes 'nub' (I've seen this in another clue).
'upon reflection' shows that the letters should be reversed in order.
'nub' reversed gives 'bun'.
'trial' placed around 'bun' is 'TRIBUNAL'.
(Other definitions for tribunal that I've seen before include "Hearing" , "Assembly to conduct judicial business" , "Judgement seat" , "Court appointed to look into a particular matter" , "examination" .)