Fellow sailor is legendary (3)

I believe the answer is:

fab

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'legendary' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?

'fellow sailor' is the wordplay.
'fellow' becomes 'F' (abbreviation - of a society etc.).
'sailor' becomes 'ab' (abbreviation for able seaman).
'f'+'ab'='FAB'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for fab that I've seen before include "Excellent (slang)" , "Marvellous (sl.)" .)

I've seen this clue in the Sydney Morning Herald.

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