The most common and most likely answer to this crossword clue is the 7 letter word VIRUSES
I've seen this crossword clue in The Sunday Telegraph
V
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More clues leading to the result VIRUSES
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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 VIRUSES mean?
VIRUSES noun- A submicroscopic, non-cellular structure consisting of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and often causes disease in the host organism.
- A disease caused by these organisms.
- Venom, as produced by a poisonous animal etc.
- A type of malware which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as disks, often causing damage to systems and data; also computer virus.
- Any type of malware.