Face shocking treatment, in a manner of speaking (7)
I believe the answer is:
dialect
'in a manner of speaking' is the definition.
(I've seen this before)
'face shocking treatment' is the wordplay.
'face' becomes 'dial' (dial is a kind of face).
'shocking treatment' becomes 'ect' (electro-convulsive therapy).
'dial'+'ect'='DIALECT'
(Other definitions for dialect that I've seen before include "Local form of language" , "Regional version of a language" , "Local language variant" , "Vernacular" , "Regional form of speech" .)