Crossword Genius

Most proficient (6)

Ross

I believe the answer is:

ablest

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

This is the entire clue.

(Other definitions for ablest that I've seen before include "Most proficient" , "Most suitable" , "Most competent in stable" , "Like pupils in top stream" , "Are highly favoured like" .)

I've seen this clue in The Guardian.
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