"Good work!" (4)
'good work' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nice that I've seen before include "Attractive Mediterranean resort" , "Leading resort on the French Riviera" , "French seaport in SE - sounds pleasant" , "French city - sounds plesant" , "Riviera resort locals call 'La Cote d'Azur'" .)
(Other definitions for well done that I've seen before include "Congratulations - certainly not rare!" , "Congratulations - cooked right through" , "expression of praise" , "Bravo!" , "expression of approval" .)
(Other definitions for philanthropy that I've seen before include "Promotion of others' welfare" , "Altruism" , "beneficial treatment" , "Love of mankind" , "Practical benevolence" .)