Crossword Genius

Crucial (5)

Ross

'crucial' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for key that I've seen before include "Essential; solution" , "Device for lock" , "Lock undoer" , "Lock opener; low island" , "Coral reef off southern coast of Florida" .)

I've seen this clue in the Universal, the Penny Press, the Newsday, the USA Today, The Telegraph and the King Feature Syndicate.
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