Cryptic crossword clue
Deaf old fellow’s first to appear in severe part of court case 4,2,7

The most common and most likely answer to this crossword clue is the 4 plus 2 plus 7 letter word HARD OF HEARING

I've seen this crossword clue in The Times
H
A
R
D
O
F
H
E
A
R
I
N
G

Buddy explains!

The straight part
We know that "Deaf" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deaf = hard of hearing.
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.

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