Voyage any skipper would try to avoid (4)
I believe the answer is:
trip
'voyage' is the definition.
(I know that voyage is a more specific form of the action journey)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for trip that I've seen before include "Excursion (maybe hallucinatory!)" , "a result of drug-taking" , "Short excursion" , "Run lightly" , "Err; journey" .)