Crossword Genius

Chief of the bunch? (3)

Ross

I believe the answer is:

key

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'chief' 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 "Device for lock" , "Piano lever" , "Lock undoer" , "Lock-opener" , "Crucial arch-stone" .)

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