Vaccinate (9)
'vaccinate' is the definition.
(synonyms)
This is all the clue.
(Other definitions for inoculate that I've seen before include "to prevent infection" , "Inject against a disease" , "Graft" , "Give a jab" , "Induce immunity" .)
'vaccinate' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for immunise that I've seen before include "Make resistant to disease" , "Inoculate against" , "Vaccinate" , "Make safe from infection" , "Make resistant to infection as by innoculation" .)