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Stopper (4)

Ross

There are a few possibilities for this:

'stopper' is the definition.
(synonyms)

This is the entire 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 Newsday, the Evening Standard, The Telegraph, the Penny Press, The Guardian, The Independent, the Sydney Morning Herald, The Mirror and The New York Times.
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