Empty pan filled with uncooked seafood (5)
I believe the answer is:
prawn
'seafood' is the definition.
(prawn is a kind of seafood)
'empty pan filled with uncooked' is the wordplay.
'empty' means to remove the middle letters.
'filled with' is an insertion indicator.
'uncooked' becomes 'raw' (similar in meaning).
'pan' with its centre taken out is 'pn'.
'pn' enclosing 'raw' is 'PRAWN'.
(Other definitions for prawn that I've seen before include "Cocktail ingredient" , "Marine crustacean" , "Small tasty crustacean, nice in cocktail" , "Popular oriental snack" , "Shellfish" .)