Fit to sail (9)
I believe the answer is:
seaworthy
'fit to sail' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for seaworthy that I've seen before include "Safe to sail in" , "(Of ship) fit to set sail" , "Able to endure stormy weather" , "In a fit state for ocean voyage" .)