Crossword Genius

Vi's age? (3)

Ross

I believe the answer is:

six

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This clue might be a double definition.

'vi's' is the first definition.
(synonyms)

'age?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

Can you help me to learn more?

(Other definitions for six that I've seen before include "Maximum cricket hit" , "Number of bowls in a cricket over" , "Half-dozen" , "Knock for . . . - surprise or defeat" , "Airborne boundary hit" .)

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