Preserved food appropriate after party (6)
I believe the answer is:
confit
'preserved food' is the definition.
(type of meat dish)
'appropriate after party' is the wordplay.
'appropriate' becomes 'fit' ('fit' can be similar in meaning to 'appropriate').
'after' is a charade indicator (letters next to each other).
'party' becomes 'con' (abbreviation for Conservatives).
'fit' put after 'con' is 'CONFIT'.
(Other definitions for confit that I've seen before include "version of canard" , "Maybe duck" , "Dish of meat cooked in its own fat" , "sweet" .)