Crossword Genius

Microscopic infectious agent (5)

Ross

I believe the answer is:

virus

'microscopic infectious agent' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for virus that I've seen before include "Cause of computer malfunctions?" , "agent with bad influence" , "Pathogenic agent" , "Cause of infection (in people and computers)" , "Ultramicroscopic infectious agent" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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