Crossword Genius

Vicious pair in shower? (3-3-3)

Ross

I believe the answer is:

cat-and-dog

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'vicious' is the definition.
Both the definition and answer are adjectives.
Maybe you can see a link between them that I don't see?

I can't explain the remainder of the clue.

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(Another definition for cat-and-dog that I've seen is " See 7".)

I've seen this clue in The Guardian.
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