The most common and most likely answer to this crossword clue is the 6 letter word EARWAX
I've seen this crossword clue in The Times
E
A
R
W
A
X
More clues leading to the result EARWAX
- Aware sloppy kiss could be a problem for listeners
- Merit increase having eliminated new impediment to hearing
- Obstruction to hearing to increase after sources of evidence affect retrial
- Organ swell may affect one’s hearing
- Yellow stuff, some corn gets to grow bigger
- Mucky material in the Listener
- Obstruction in the way of listener
- Organ swell that may affect one’s hearing
- Each river to increase muck in canal
- A war broke out with Ex. I was deafened because of it
Buddy explains!

The straight part
We know that "problem for listeners" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case problem for listeners = earwax.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 EARWAX mean?
EARWAX noun- A waxy substance secreted by the ear.