The most common and most likely answer to this crossword clue is the 4 letter word FOWL
F
O
W
L
More clues leading to the result FOWL
- Turkey perhaps unpalatable, by the sound of it
- Fine bird, and one that provides us with eggs
- Bird, female bird
- Fine bird, one for the table
- Chicken perhaps yucky, it’s said?
- Female bird? Not necessarily
- Perhaps hen is female bird
- Disease, nasty-sounding — pets affected
- Bird, female bird of prey
- Virus makes bird quiet during party
Buddy explains!

The straight part
We know that "Virus" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case virus = fowl.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 FOWL mean?
FOWL noun- A bird.
- A bird of the order Galliformes, including chickens, turkeys, pheasant, partridges and quail.
- Birds which are hunted or kept for food, including Galliformes and also waterfowl of the order Anseriformes such as ducks, geese and swans.
- To hunt fowl.
- Foul