Throw rest out as seafood (7)
I believe the answer is:
lobster
'seafood' is the definition.
(lobster is a kind of seafood)
'throw rest out' is the wordplay.
'throw' becomes 'lob' (to lob something is to chuck or throw it).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'rest' is an anagram of 'ster'.
'lob'+'ster'='LOBSTER'
'as' is the link.
(Other definitions for lobster that I've seen before include "one to loft a > shellfish?" , "Bolster up the sea-creature" , "Lets bro have the shellfish" , "Bolster (anag.)" , "food?" .)