Cryptic crossword clue
They offer treatment to those almost past being cured 10

The most common and most likely answer to this crossword clue is the 10 letter word OSTEOPATHS

I've seen this crossword clue in The Guardian
O
S
T
E
O
P
A
T
H
S

Buddy explains!

The straight part
We know that "They offer treatment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they offer treatment = osteopaths.
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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