Crossword Genius

Stopper (4)

Ross

There are a few possibilities for this:

'stopper' is the definition.
(synonyms)

This is all the clue.

(Other definitions for plug that I've seen before include "Stopper - publicise" , "Bung -- promotion" , "It fits into electric socket" , "Spigot" , "Promote" .)

I've seen this clue in The Telegraph, The Independent, The New York Times, the Sydney Morning Herald, The Guardian, the Penny Press, the Evening Standard, The Mirror and the Newsday.
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