In a large saucepan, heat 2" of oil to 350 degrees. Meanwhile, in a medium bowl, whisk the all purpose floue with cornmeal, baking powder, 1 1/4 teaspoons of salt and pinch of black pepper. Add the eggs, clam broth, and beer, and whisk until the batter is smooth. Fold in scallops, scallions, onion, and jalapeno.
Working in batches, drop heaping teaspoons of the batter into the oil and fry, turing occasionally, until golden brown all over, about 7 minutes. Using a slotted spoon, transfer the fritter to paper towels. Serve with tartar sauce and lemon wedges.