Ready, willing, and ____ (4)

I believe the answer is:

(Other definitions for able that I've seen before include "Of high proficiency" , "Proficient; skilful" , "accomplished" , "Capable seaman" , "Fit as a seaman" .)

I've seen this clue in The Star Tribune, The Mirror, the USA Today, The Washington Post, the Newsday and The New York Times.

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