Ship in an end product of great weight (9)
I believe the answer is:
important
'ship in an end product of great weight' is the definition.
I can't tell whether this defines the answer.
'ship in an end product' is the wordplay.
'ship in' becomes 'import' (to ship something in is to import it by ship).
'end' suggests the final letters.
The final letter of 'product' is 't'.
'import'+'an'+'t'='IMPORTANT'
Can you help me to learn more?
(Other definitions for important that I've seen before include "Leading" , "of great concern" , "material" , "Crucial" , "Main" .)