Pronounced hardship for one working on sailing ship (6)
I believe the answer is:
rigger
'one working on sailing ship' is the definition.
(someone who rigs a ship)
'pronounced hardship' is the wordplay.
'pronounced' indicates a 'sounds like' (homophone) clue.
'hardship' becomes 'rigor' (synonyms).
'rigor' sounds like 'RIGGER'.
'for' is the link.
(Other definitions for rigger that I've seen before include "'Long, pointed brush used by artists (6)'" , "oilman" , "Scaffolding worker" , "Sailing ship; fraud" , "Scaffolder" .)