Potatoes mashed to go with healthy skin treatment? (10)

I believe the answer is:

osteopathy

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'treatment?' is the definition.
(osteopathy is a kind of treatment)

'potatoes mashed to go with healthy skin' is the wordplay.
'mashed' is an anagram indicator.
'to go with healthy skin' becomes 'hy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'potatoes' with letters rearranged gives 'osteopat'.
'osteopat'+'hy'='OSTEOPATHY'

Can you help me to learn more?

(Other definitions for osteopathy that I've seen before include "treatment" , "form of therapy" .)

I've seen this clue in The Independent.

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