The most common and most likely answer to this crossword clue is the 8 letter word AUDITORY
I've seen this crossword clue in Financial Times
A
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More clues leading to the result AUDITORY
- Car blue, in one sense?
- European car maker, right-winger, as one hears
- Inspector at very end of hearing
- Hearing car, attempt to cross over
- Accountant — the ultimate in economy of hearing
- Applaud it or yawn inwardly — it’s to do with what you hear
- Hearing related to blocking diary radical union leader’s penned
- About perception of sound from car by English party member
Buddy explains!

The straight part
We know that "of hearing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of hearing = auditory.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AUDITORY mean?
AUDITORY adjective- Of, or relating to hearing, or to the sense or organs of hearing
- An assembly of hearers; an audience.
- An auditorium.