Sent back manufactured cheese (4)
I believe the answer is:
edam
'cheese' is the definition.
(I've seen this before)
'sent back manufactured' is the wordplay.
'sent back' says the letters should be written backwards.
'manufactured' becomes 'made' (I've seen this before).
'made' reversed gives 'EDAM'.
(Other definitions for edam that I've seen before include "Cheese made in Holland" , "Hard Dutch cheese" , "Sphere of Dutch cheese" , "edible sphere" , "Dutch specialty" .)