Crossword Genius

Very proficient (5)

Ross

I believe the answer is:

adept

'very proficient' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for adept that I've seen before include "One who is very skilful" , "One very skilled at work" , "Very skilful, proficient" , "Having the required skills" , "Master" .)

I've seen this clue in The Sun and The Times.
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