Crossword Genius

Submicroscopic infective agent (5)

Ross

I believe the answer is:

virus

(Other definitions for virus that I've seen before include "Illegal program introduced maliciously into computers to disrupt them" , "Microscopic infectant" , "One infecting human, computer" , "What may kill your computer" , "Malicious code" .)

I've seen this clue in the Sydney Morning Herald.
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