In talk, entice to accept shocking treatment (7)
I believe the answer is:
lecture
'in talk' is the definition.
'lecture' can be an answer for 'talk' (synonyms). I am unsure of the 'in' bit.
'entice to accept shocking treatment' is the wordplay.
'entice' becomes 'lure' (synonyms).
'to accept' is an insertion indicator.
'shocking treatment' becomes 'ect' (electro-convulsive therapy).
'lure' enclosing 'ect' is 'LECTURE'.
(Other definitions for lecture that I've seen before include "University talk" , "Sermon" , "Class at university" , "Formal talk on a subject" , "Instructional talk" .)