Crossword Genius

Soft silvery-white metal; symbol K (9)

Ross

I believe the answer is:

potassium

(Other definitions for potassium that I've seen before include "Soft metallic element" , "Soft reactive metal" , "Element K" , "Silvery metallic element" , "... is its atomic number: symbol K" .)

I've seen this clue in The Mirror.
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