Fit to sail in other ways, possibly (9)
I believe the answer is:
seaworthy
'fit to sail' is the definition.
(I've seen this before)
'other ways possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'other'+'ways'='otherways'
'otherways' anagrammed gives 'SEAWORTHY'.
'in' is the link.
(Other definitions for seaworthy that I've seen before include "(Of ship) fit to set sail" , "Able to endure stormy weather" , "Safe to sail in" , "In a fit state for ocean voyage" .)