Crossword Genius

A seaman can be so skilled (4)

Ross

I believe the answer is:

able

I believe this clue is a double definition.

'a seaman' is the first definition.
(an able seaman is a type of seaman)

'skilled' is the second definition.
(I've seen this in another clue)

'can be so' acts as a link.

(Other definitions for able that I've seen before include "accomplished" , "Capable or proficient" , "Having the skills and qualifications required" , "Fully competent" , "Skilled" .)

I've seen this clue in The Sun.
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