Dish, hot one, after some uncooked seafood starters (5)
I believe the answer is:
Here is my best explanation:
'dish' is the definition.
(sushi is a kind of dish)
'hot one after some uncooked seafood starters' is the wordplay.
'hot' becomes 'h'.
'one' becomes 'i' (Roman numeral**).
'after' means one lot of letters go next to another.
'starters' says to take the initial letters.
The first letters of 'some uncooked seafood' is 'sus'.
'hi' after 'sus' is 'SUSHI'.