"Good going!" (4)
I believe the answer is:
nice
'good going' 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 "Pleasant - French resort" , "Amiably pleasant" , "Fine as in distinction, or pleasant" , "Riviera resort locals call 'La Cote d'Azur'" , "Pleasant Riviera town?" .)