Crossword Genius

Expert, genius (6)

Ross

I believe the answer is:

master

I believe this clue is a double definition.

'expert' is the first definition.
(I know that master is a type of authority)

'genius' is the second definition.
(thesaurus)

(Other definitions for master that I've seen before include "Lord of a stream" , "Craftsperson of great skill" , "Lord - controller - teacher" , "Male teacher or ship's captain" , "Strong chess player" .)

I've seen this clue in The Telegraph.
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