Crossword Genius

Kitty's euphoric vibes? (4)

Ross

I believe the answer is:

purr

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This could be a double definition.

'kitty's' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'euphoric vibes?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for purr that I've seen before include "Tiddles' sound" , "content? I might" , "Sound of feline content" , "Sound of contentment" , "Make low, contented sound" .)

I've seen this clue in The Globe and Mail.
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