You could call it bubbly (4)

I believe the answer is:

foam

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'you' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand how the rest of the clue works.

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(Other definitions for foam that I've seen before include "Lather, froth" , "Fizz, froth" , "Froth created by wave or soap" , "At the mouth, this may mean madness or extreme anger" , "Froth, bubbles" .)

I've seen this clue in the Evening Standard.

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