Crossword Genius

We heard vowel sounds (3,3,1)

Ross

I believe the answer is:

you and i

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'we' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for you and i that I've seen is " We two".)

I've seen this clue in The Guardian.
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