Product that's often shipped from Ostia Antica or Canopus, say? (6)
I believe the answer is:
export
'product' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for export that I've seen before include "ship overseas" , "Carry out of country" , "Sell goods abroad" , "Item sent abroad" , "Sell or transfer abroad" .)