The most common and most likely answer to this crossword clue is the 7 letter word INCUDES
I've seen this crossword clue in The Times
I
N
C
U
D
E
S
Buddy explains!

The straight part
We know that "hard parts of Listener" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hard parts of listener = incudes.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 INCUDES mean?
INCUDES noun- A small anvil-shaped bone in the middle ear.
- An accessory cloud, in the shape of an anvil which forms by spreading at the top of a cumulonimbus.