Takes off for journey aboard ship (6)
I believe the answer is:
strips
'takes off' is the definition.
(stripping is a kind of taking off)
'journey aboard ship' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey**).
'aboard' indicates putting letters inside.
'ship' becomes 'ss'.
'trip' inserted inside 'ss' is 'STRIPS'.
'for' is the link.
(Other definitions for strips that I've seen before include "Gets undressed" , "layers" , "Long narrow pieces" , "Bands" , "Takes off clothes" .)