Face shock 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 shock treatment' is the wordplay.
'face' becomes 'dial' (dial is a kind of face).
'shock treatment' becomes 'ect' (ECT is an example).
'dial'+'ect'='DIALECT'
(Other definitions for dialect that I've seen before include "talk from the regions" , "Manner of speaking" , "Local language version" , "Local speech variant" , "Local way of speaking" .)