Switched mail order with inferior packaging that's made of recycled waste (7,4)
I believe the answer is:
compost heap
'packaging that's made of recycled waste' is the definition.
I know nothing about this answer so I can't judge whether this works.
'switched mail order with inferior' is the wordplay.
I cannot really understand how this works, but
'mail' could be 'post' (synonyms) and 'post' is found in the answer.
'order' could be 'om' (Order of Merit) and 'om' is located in the answer.
'inferior' could be 'cheap' (similar in meaning) and 'cheap' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for compost heap that I've seen before include "Organic waste site" , "Area for recycling" , "Pile of decomposed vegetation" , "Rotting pile of vegetable matter" , "things heat up naturally here" .)