The most common and most likely answer to this crossword clue is the 8 letter word MONAURAL
I've seen this crossword clue in Financial Times
M
O
N
A
U
R
A
L
Buddy explains!
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 MONAURAL mean?
MONAURAL adjective- Of, relating to, affecting, or designed for use with one ear.
- Monophonic