Satisfactory penalty (4)
I believe the answer is:
fine
This clue is a double definition.
'satisfactory' is the first definition.
(thesaurus)
'penalty' is the second definition.
(I've seen this before)
(Other definitions for fine that I've seen before include "Excellent kind of monetary penalty" , "No special brandy" , "French brandy" , "Fee payable for misdemeanour" , "end to the music" .)