Stuff carried in cold Greek ship (5)
I believe the answer is:
cargo
'ship' is the definition.
(cargo ship is a kind of ship)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for cargo that I've seen before include "stuff to be carried by ship" , "Baggage" , "Stuff on board" , "This taken on board" , "Goods in transit" .)