Fine. Try to get the party returned (4)
I believe the answer is:
Here is my best explanation:
'fine' is the definition.
(I've seen this before)
'try to get the party returned' is the subsidiary indication.
'try' becomes 'go' (go is a kind of try).
'to get' means one lot of letters go next to another.
'the party' becomes 'do' (do is a kind of party).
'returned' shows that the letters should be reversed in order.
'do' in reverse letter order is 'od'.
(Other definitions for good that I've seen before include "Righteous", "benefit", "Carol character from 1 as of old", "and 22 Down and 14 Across: Christmas carol", "(Of child) well-behaved", "promoting welfare", "Fine", "Priestley's companions", "Obedient" and "Pleasing; virtuous".)