Crossword Genius

Proficiently (4)

Ross

I believe the answer is:

well

'proficiently' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for well that I've seen before include "Issue forth" , "Flow up" , "Bore; very much" , "Lift-shaft" , "Source; in good health" .)

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