The most common and most likely answer to this crossword clue is the 5 plus 3 letter word PARMA HAM
I've seen this crossword clue in The Times
P
A
R
M
A
H
A
M
More clues leading to the result PARMA HAM
Buddy explains!
The straight part
We know that "One’s cured" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s cured = parma ham.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.