Crossword Genius

It became yours (5)

Ross

I believe the answer is:

thine

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'yours' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for thine that I've seen is " Yours (archaic)".)

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