Answer: culches

AnswerCrossword Clue
culchesthe spawn of oysters
culchesto prepare (an oyster bed) with culch
culchesthe stones, old shells, etc., forming an oyster bed and furnishing points of attachment for the spawn of oysters
culchesrubbish; refuse
culchesCULCH, clean trash eg string, paper, also CULTCH, SCULCH, SCULTCH