Crossword Genius

Sink stopper (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sink stopper</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for plug that I've seen before include "Stop - advertising" , "See 19" , "It fits into electric socket" , "Publicise -- stop" , "quid" .)

I've seen this clue in The Mirror and The Times.
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