Seafood for small person (6)
I believe the answer is:
shrimp
This clue is a double definition.
'seafood' is the first definition.
(I know that shrimp is a type of seafood)
'small person' is the second definition.
(shrimp is a kind of small person)
'for' acts as a link.
(Other definitions for shrimp that I've seen before include "Raising of a siege" , "tiny fellow!" , "tiny chap" , "Small crustacean often found in cocktail" , "Small edible crustacean" .)