Mercury (11)

I believe the answer is:

quicksilver

'mercury' is the definition.
(synonyms)

This is all the clue.

(Other definitions for quicksilver that I've seen before include "Liquid mercury" , "Element of dentistry" , "so rapid" , "Mercury - volatile" .)

I've seen this clue in the New York Times, The Telegraph, The Guardian, the Sydney Morning Herald, The Independent, The Mirror, The Times and the Canadiana.

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