The most common and most likely answer to this crossword clue is the 10 letter word INOCULATED
I've seen this crossword clue in Independent
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Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does INOCULATED mean?
INOCULATED verb- To introduce an antigenic substance or vaccine into something (e.g. the body) or someone, such as to produce immunity to a specific disease.
- (by extension) To safeguard or protect something as if by inoculation.
- To add one substance to another; to spike.
- To graft by inserting buds.
- To introduce into the mind (used especially of harmful ideas or principles); to imbue; to implant.