Crossword Genius

Under lock and __ (3)

Ross

I believe the answer is:

key

(Other definitions for key that I've seen before include "//www.crosswordgiant.com/crossword-clue/1252911/" , "Device for lock" , "Crucially important" , "Crucial arch-stone" , "One that locks" .)

I've seen this clue in the Newsday.
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