The most common and most likely answer to this crossword clue is the 9 letter word CHIROPODY
C
H
I
R
O
P
O
D
Y
Buddy explains!
The straight part
We know that "Treatment that can be good for the soul, by the sound of it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case treatment that can be good for the soul, by the sound of it = chiropody.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 CHIROPODY mean?
CHIROPODY noun- The branch of medicine concerned with the diagnosis and treatment of diseases of the feet (and formerly the hands)