A pig died on the ship (6)
I believe the answer is:
aboard
'on the ship' is the definition.
(I've seen this before)
'a pig died' is the wordplay.
'pig' becomes 'boar' (I've seen this in other clues).
'died' becomes 'd' (abbreviation next to the year of someone's death).
'a'+'boar'+'d'='ABOARD'
(Other definitions for aboard that I've seen before include "Part of the group" , "... [CRUISE SHIP] here, perhaps" , "On ship or plane - not on land" , "on base" , "on boat, perhaps" .)