Crossword Genius

In a sense old, but no veteran (7)

Ross

I believe the answer is:

vintage

I'm a little stuck... Click here to teach me more about this clue!

'sense old but no veteran' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'in a' is the wordplay.
I cannot really see how this works, but
'in' is present in the answer.
'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for vintage that I've seen before include "High-quality wine" , "classic" , "Wine of a good year" , "Old" , "Wine harvest" .)

I've seen this clue in the Evening Standard.
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