Passage aboard ship (7)
I believe the answer is:
gangway
This clue might be a double definition.
'passage' is the first definition.
(gangway is a kind of passage)
'aboard ship' is the second definition.
'gangway' can be an answer for 'ship' (thesaurus). I am not certain of the 'aboard' bit.
Can you help me to learn more?
(Other definitions for gangway that I've seen before include "part of ship" , "Let us get past" , "Aisle; ship access" , "means to secure passage on ship" , "Aisle between seats" .)