The $17 appetizer of fried Ipswich clams at the seafood restaurant Kinkead’s is close to perfect: The clams are crisp, chewy, greaseless, and accompanied by house-made tartar sauce and frizzled lemon slices. At the much more casual Georgetown fish shack Tackle Box, fried clams—full-belly in summer—also make a stellar appearance in a pile with tartar sauce or in a made-for-the-restaurant bun as a clam roll (each $12).