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Promise to include perhaps Milton Keynes's last regressive therapist (9)

Ross

I believe the answer is:

osteopath

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'therapist' is the definition.
(osteopath is a kind of therapist)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for osteopath that I've seen before include "Health professional" , "Health worker" , "Bone manipulator" , "Specialist manipulator of bones and muscles" , "Potato she uses badly as a manipulator of the body" .)

I've seen this clue in The Independent.
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