Goes away with stuff aboard ship (6)
I believe the answer is:
scrams
'goes away' is the definition.
(scramming is a kind of going away)
'stuff aboard ship' is the wordplay.
'stuff' becomes 'cram' (cramming is a kind of stuffing**).
'aboard' means one lot of letters goes inside another.
'ship' becomes 'ss'.
'cram' put into 'ss' is 'SCRAMS'.
'with' is the link.
(Other definitions for scrams that I've seen before include "Suddenly leaves" , "goes off, it's said" , "Buzzes off, vamooses" .)