Cryptic crossword clue
Ongoing mutation of viral infection a bad sign? 4

The most common and most likely answer to this crossword clue is the 4 letter word FLUX

I've seen this crossword clue in The Guardian
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The straight part
We know that "Ongoing mutation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ongoing mutation = flux.
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 FLUX mean?

FLUX noun
  1. The act of flowing; a continuous moving on or passing by, as of a flowing stream.
  2. A state of ongoing change.
  3. A chemical agent for cleaning metal prior to soldering or welding.
  4. The rate of transfer of energy (or another physical quantity) through a given surface, specifically electric flux, magnetic flux.
  5. A disease which causes diarrhea, especially dysentery.
  6. Diarrhea or other fluid discharge from the body.
  7. The state of being liquid through heat; fusion.
FLUX verb
  1. To use flux on.
  2. To melt.
  3. To flow as a liquid.
FLUX adjective
  1. Flowing; unstable; inconstant; variable.

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