The most common and most likely answer to this crossword clue is the 6 letter word SEADOG
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More clues leading to the result SEADOG
Buddy explains!

The straight part
We know that "sailor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sailor = seadog.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SEADOG mean?
SEADOG noun- A sailor accustomed to the sea.
- A pirate.
- A seal. (marine mammal)
- A charge resembling the talbot but with scales, webbed feet and a broad tail.
- A dogfish.
- An omen of bad luck.
- A white-topped wave in an estuary.