The most common and most likely answer to this crossword clue is the 9 plus 2 letter word SEAWORTHY SE
S
E
A
W
O
R
T
H
Y
S
E
Buddy explains!
The straight part
We know that "fit for shipping?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fit for shipping? = seaworthy se.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.