Inject iodine and clean out after surgery (9)
I believe the answer is:
inoculate
'inject' is the definition.
(inoculating is a kind of injecting)
'iodine and clean out after surgery' is the wordplay.
'iodine' becomes 'I' (I is the chemical symbol for iodine).
'and' is a charade indicator (letters next to each other).
'after surgery' is an anagram indicator.
'clean'+'out'='cleanout'
'cleanout' anagrammed gives 'noculate'.
'i'+'noculate'='INOCULATE'
(Other definitions for inoculate that I've seen before include "Immunise with antigens" , "Induce immunity" , "Introduce an idea or attitude into the mind of: immunise" , "give someone the needle" , "Imbue" .)