Go on the ship or be a member of the crew (6)
I believe the answer is:
sailor
'a member of the crew' is the definition.
(I've seen this in another clue)
'go on the ship or' is the wordplay.
'go on the ship' becomes 'sail' (I am not sure about this - if you are sure you should believe this answer much more).
'sail'+'or'='SAILOR'
'be' is the link.
Can you help me to learn more?
(Other definitions for sailor that I've seen before include "Seaman" , "Sinbad, for example" , "Member of a ship's crew" , "Person who goes to sea" , "Jack" .)