Answer: stopup

AnswerCrossword Clue
STOPUPClog
STOPUPVisit the penthouse
STOPUPPrevent drainage in
STOPUPClog, as a drain
STOPUPStick a cork in
STOPUPPlug
STOPUPObstruct.
STOPUPClog.
STOPUPPlug.
STOPUPBlock: Colloq.
STOPUPPlug, as a hole
STOPUPPut a cork in