Medical treatment that is shocking! (14)

I believe the answer is:

electrotherapy

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'medical treatment that is shocking' is the definition.
(therapy using electric shocks)

'medical treatment' is the wordplay.
'medical' becomes 'electro' (I am not sure about this - if you are sure you should believe this answer much more).
'treatment' becomes 'therapy' (synonyms).
'electro'+'therapy'='ELECTROTHERAPY'

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I've seen this clue in The Telegraph.

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