The most common and most likely answer to this crossword clue is the 8 letter word RETRYING
I've seen this crossword clue in Financial Times
R
E
T
R
Y
I
N
G
Buddy explains!

The straight part
We know that "hearing again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hearing again = retrying.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 RETRYING mean?
RETRYING verb- To try or attempt again.
- To try judicially a second time.