Hearing test broken by Big Ears? (8)
I believe the answer is:
tribunal
'hearing' is the definition.
(I've seen this before)
'test broken by big ears?' is the wordplay.
'test' becomes 'trial' (synonyms).
'broken by' means one lot of letters goes inside another (inserted letters break into the word).
'big ears?' becomes 'bun' (I can't justify this - if you can you should believe this answer much more).
'trial' placed around 'bun' is 'TRIBUNAL'.
Can you help me to learn more?
(Other definitions for tribunal that I've seen before include "Special investigation team constituted in brutal mode" , "Court appointed to look into a particular matter" , "Court, investigative board" , "Judgement seat" , "Assembly to conduct judicial business" .)