Winter illness (3)

I believe the answer is:

flu

'winter illness' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for flu that I've seen before include "Common infection" , "A bad winter bug" , "Infection reduced" , "Highly contagious viral disease" , "Winter ailment" .)

I've seen this clue in the Universal, the USA Today, The Sun, the L.A. Times Daily, The Star Tribune, the King Feature Syndicate, the Penny Press and the Family Time.

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