Crossword Genius

Something toxic with Plaid Cymru, and Liz Trussed? (7)

Ross

I believe the answer is:

mercury

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If this is the answer I cannot explain how the clue works.

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(Other definitions for mercury that I've seen before include "In Roman myth, the messenger of the gods" , "First rock from the Sun - Hg" , "Quicksilver" , "Planet - liquid metal" , "Metal in thermometer or barometer" .)

I've seen this clue in The Guardian.
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