Special involving battered local seafood (7)
I believe the answer is:
scallop
'seafood' is the definition.
(scallop is a kind of seafood)
'special involving battered local' is the wordplay.
'special' becomes 'sp' (abbreviation).
'involving' means one lot of letters goes inside another.
'battered' is an anagram indicator.
'local' anagrammed gives 'callo'.
'sp' enclosing 'callo' is 'SCALLOP'.
(Other definitions for scallop that I've seen before include "Mollusc or lacy edge" , "Shellfish - badge worn by pilgrims to Santiago de Compostela" , "Marine mollusc" , "Bivalve with radiating ridges on shell" , "Marine bivalve" .)