Indoctrinate (9)
I believe the answer is:
inculcate
'indoctrinate' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for inculcate that I've seen before include "drill" , "Habitually stress the idea" , "Instil (idea) by persistent instruction" , "Impress on the mind" , "Din into" .)