The most common and most likely answer to this crossword clue is the 9 letter word SEAWORTHY
I've seen this crossword clue in The Daily Telegraph
S
E
A
W
O
R
T
H
Y
More clues leading to the result SEAWORTHY
- Said what VIP spotter will do is fine in the main
- Fit for the voyage? In other ways, perhaps
- Ready for the main other ways on journey
- Row as they trained to be fit for voyage
- Admiral, for example, fit to sail
- OK in the main, others way different
- Essentially not water shy, in proper shape?
- Rosa, we tossed your safe in the water
Buddy explains!

The straight part
We know that "fit for voyage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fit for voyage = seaworthy.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 SEAWORTHY mean?
SEAWORTHY adjective- Fit for service at sea.