Crossword Genius

Critical (3)

Ross

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3

7

key

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">critical</span>' is the definition.<br/ ><span class="explanation-format__explanation">(key can mean very important)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for key that I've seen before include "Clue" , "Of crucial importance" , "Lock undoer" , "Typewriter button, isle" , "//www.crosswordgiant.com/crossword-clue/1252911/" .)

I've seen this clue in The Wall Street Journal, the Newsday and The Telegraph.
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