Banish material, two tons of it ditched (5)
I believe the answer is:
exile
'banish' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for exile that I've seen before include "Person dismissed from country" , "Person forced to live abroad" , "Expel from home or country" , "One barred from their native country" , "Overseas banishment" .)