Vi's age? (3)
I believe the answer is:
six
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" .)