Seafood for a small person (6)
I believe the answer is:
shrimp
I believe this is a double definition.
'seafood' is the first definition.
(I know that shrimp is a type of seafood)
'for a small person' is the second definition.
(shrimp is a kind of small person)
(Other definitions for shrimp that I've seen before include "Small crustacean often found in cocktail" , "Raising of a siege" , "Crustacean; small child" , "Tasty crustacean found in cocktails" , "Runt" .)