The most common and most likely answer to this crossword clue is the 10 letter word STONE-DEAF
I've seen this crossword clue in Financial Times
S
T
O
N
E
-
D
E
A
F
More clues leading to the result STONE-DEAF
Buddy explains!
The straight part
We know that "cannot hear" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cannot hear = stone-deaf.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 STONE-DEAF mean?
STONE-DEAF adjective- Completely deaf.