Viral infection (9)

I think it could be either:

Which length description are you looking for?:

influenza

'viral infection' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for influenza that I've seen before include "Common infection" , "Viral infection" , "Viral complaint" , "Respiratory complaint" , "Nasty viral disease, usually of winter" .)

I've seen this clue in The Guardian and The Sunday Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.