Answer: unstop

AnswerCrossword Clue
UNSTOPClear
unstopto remove a stopper from
unstopto remove the stopper from
unstopto free from any obstruction; open
unstopto draw out the stops of (an organ)
UNSTOPPull a cork from
UNSTOPClear a clog
UNSTOPClear the drain
UNSTOPRemove the cap
UNSTOPUse a plunger
UNSTOPPull a cork out of
UNSTOPRemove a clog from
UNSTOPRemove the cork from
UNSTOPOpen
UNSTOPClear up a clog
UNSTOPRemove a plug
UNSTOPFree from obstruction.
UNSTOPOpen.
UNSTOPClear of clogs
UNSTOPClear, as a drain
UNSTOPOpen, as a dam
UNSTOPLet drain, as a sink
UNSTOPUse Liquid-Plumr, say