Crossword Genius

Better than prison? Jolly good! (4)

Ross

I believe the answer is:

fine

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'good' is the definition.
(both can mean satisfactory)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fine that I've seen before include "Sheer or very good" , "Excellent kind of monetary penalty" , "Acceptable - punishment" , "Money penalty is clear and dry" , "Dry and sunny" .)

I've seen this clue in the Evening Standard.
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