Crossword Genius

Become proficient in (6)

Ross

I believe the answer is:

master

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">become proficient in</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for master that I've seen before include "Strong chess player" , "Maestro; teacher" , "Craftsperson of great skill" , "The boss" , "Male teacher or ship's captain" .)

I've seen this clue in the Newsday and The Independent.
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