Cuts of meat go bad aboard ship (7)
I believe the answer is:
saddles
'cuts of meat' is the definition.
'go bad aboard ship' is the wordplay.
'go bad' becomes 'addle' (addling is a kind of going bad).
'aboard' indicates putting letters inside.
'ship' becomes 'ss'.
'addle' inserted within 'ss' is 'SADDLES'.
(Other definitions for saddles that I've seen before include "Seats for horses" , "Riders' seats" , "Bicycle seats" , "Jockeys' seats" , "Burdens" .)