Puzzle 12

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ClueSolution
Oscar-winning actor KevinKLINE
KLINE
arranges by hierarchySTRATIFIES
STRATIFIES
Sotheby's employeesAUCTIONEERS
AUCTIONEERS
Hawaiian "thanks"MAHALO
MAHALO
lake in upstate New YorkPLACID
PLACID
places (down)LAYS
LAYS
hardened, as a boneCALCIFIED
CALCIFIED