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Crossword solution:

7 clues for "KER":

  1. Prefix for plunk
  2. Lead-in to "plunk" or "plop"
  3. ___-plop!
  4. ___ "Plunk"
  5. Prefix with flop or plunk
  6. Prefix with plunk or flop
  7. Prefix with plunk or plop.