Crossword Genius

Proficient (6)

Ross

There are a few possibilities for this:

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4 5

6

7 12

'proficient' is the definition.
(I know that proficient can be written as expert)

This is the entire clue.

(Other definitions for expert that I've seen before include "Specialist, pundit" , "Knowledgeable specialist" , "Dab hand" , "One has specialist knowledge or ability" , "At the right moment" .)

I've seen this clue in the Evening Standard and The New York Times.
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