The most common and most likely answer to this crossword clue is the 9 letter word ZOMBIFIED
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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 ZOMBIFIED mean?
ZOMBIFIED adjective- Having been made into a zombie, or induced to behave in a zombie-like fashion.
- (fictional) To turn into a zombie (a member of the living dead or undead).
- To take control of (a computer) in order to use it covertly and illicitly.