Improved in health without your old-fashioned healer (10)
I believe the answer is:
bonesetter
'old-fashioned healer' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'improved in health without your' is the wordplay.
'improved in health' becomes 'better' (I can't explain this - if you can you should believe this answer much more).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'your' becomes 'ones' (I've seen this in other clues).
'better' enclosing 'ones' is 'BONESETTER'.
Can you help me to learn more?
(Other definitions for bonesetter that I've seen before include "Unqualified treater of fractures in times past" , "osteopath" .)