Cold dish of meat in fete, eaten at the end with prong (9)

'cold dish of meat' is the definition.
I can't tell whether this defines the answer.

'fete eaten at the end with prong' is the wordplay.
'fete' becomes 'gala' (I've seen this before).
'at the end' indicates one should take the final letters.
'with' means one lot of letters go next to another.
'prong' becomes 'tine' (tine is a kind of prong).
The final letter of 'eaten' is 'n'.
'gala'+'n'+'tine'='GALANTINE'

'in' acts as a link.

Can you help me to learn more?