Large prawns (6)
I believe the answer is:
scampi
'large prawns' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scampi that I've seen before include "Crumby seafood dish" , "Large sauteed prawns" , "Prawns (fried with breadcrumbs)" , "Cooked Norway lobsters" , "Dish of crustaceans" .)