Crossword Genius

Tough old sea captain (5)

Ross

I believe the answer is:

hardy

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

I don't understand the rest of the clue.

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(Other definitions for hardy that I've seen before include "See 16" , "Author Thomas?" , "Robust - English novelist" , "Jude, Tess author" , "He wrote" .)

I've seen this clue in the Evening Standard.
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