Sail out to eastern passageway (5)
I believe the answer is:
aisle
'passageway' is the definition.
(aisle is a kind of passageway)
'sail out to eastern' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'to eastern' becomes 'e'.
'sail' is an anagram of 'aisl'.
'aisl'+'e'='AISLE'
(Other definitions for aisle that I've seen before include "Passage between seating areas" , "Here comes the bride" , "that would-be bride hopes to make it up!" , "lateral strip" , "Passage between pews" .)