Crossword Genius

Centrally important (3)

Ross

I believe the answer is:

key

'centrally important' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for key that I've seen before include "One that locks" , "Lock-opener" , "Device for lock" , "Piano lever" , "explanation" .)

I've seen this clue in The Telegraph.
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