Crossword Genius

Major, often in a hole (3)

Ross

I believe the answer is:

key

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'major' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for key that I've seen before include "Of crucial importance" , "Vital" , "Crucially important" , "It opens the door" , "Clue" .)

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