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Travel back and forth to tap river outside of Nuremberg (4,4)

Camp fire tradition Paul Simon initially exchanges indoor activity (4-4)

Barney dumps Dee twice, for Penny, going back and forth (4-4)

Ding-dong

Never enter while multi-tasking. Correction to mine @10:

Like bells ringing, not with depth but softly to and fro (4,4)

Aunt Sally played with rubber-covered wood, balls going back and forth (4-4)

Aunt Sally - Game (fairground or pub game)
It can also mean - Sport (a target for abuse, criticism or blame/object of mockery.)

Just in case... rubber-covered wood - cock with a condom/table tennis bat.
Multiple balls are used in a match.

For correctness, aforementioned appendage is erect.

Doesn't change the clue.

No English pigeon, when cooked and used as needed, is game(4-4)

PIGON * with iteration

Sport of strapping pongid (4-4)

Game stopping half sponge contents (4 - 4)

Vacillation of flipping Pongo (4-4)

No-hoper, but can't resist the opportunity to reference a P. G. Wodehouse character (Mr. Twistleton)