Good penalty (4)
I believe the answer is:
fine
This clue is a double definition.
'good' is the first definition.
(both can mean satisfactory)
'penalty' is the second definition.
(a financial penalty)
(Other definitions for fine that I've seen before include "Very high quality money penalty" , "Fair - penalty" , "A financial penalty - excellent" , "Money paid as penalty" , "Capital - punishment" .)