Crossword Genius

Seasoned expert (4,6)

Ross

I believe the answer is:

past master

(Other definitions for past master that I've seen before include "Person experienced in a particular field" , "Adept fellow" , "Someone with a long and thorough experience in a given activity" , "Expert - former office holder" , "wizard" .)

I've seen this clue in the Sydney Morning Herald.
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