Crossword Genius

C major, for example (3)

Ross

I believe the answer is:

key

(Other definitions for key that I've seen before include "Vital" , "(3)" , "//www.crosswordgiant.com/crossword-clue/1252911/" , "Typewriter button, isle" , "Coral reef off southern coast of Florida" .)

I've seen this clue in the Universal.
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