The most common and most likely answer to this crossword clue is the 12 letter word TARRY-BREEKS
T
A
R
R
Y
-
B
R
E
E
K
S
Buddy explains!
The straight part
We know that "a Scottish sailor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a scottish sailor = tarry-breeks.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.