Experienced sailor (3,3)

I think it could be either:

Which length description are you looking for?:

3,3

sea dog

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

This is the entire clue.

(Other definitions for sea dog that I've seen before include "'Old salt (3,3)'" , "Old or experienced sailor" , "Dosage (anag)" , "Experienced sailor (colloq.)" , "mythical creature" .)

I've seen this clue in The Times and The Guardian.

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