Crossword Genius

Fine wine, unopened (4)

Ross

I believe the answer is:

okay

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

'fine' is the definition.
(I know that fine can be written as okay)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for okay that I've seen before include "in reasonable health?" , "Permissible (colloq.)" , "Satisfactory; permissible" , "Yes; satisfactory" , "Approve, endorse" .)

I've seen this clue in The Guardian and The Telegraph.
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