Dairy product manufactured upside down (4)
I believe the answer is:
edam
'dairy product' is the definition.
(Edam is an example)
'manufactured upside down' is the wordplay.
'manufactured' becomes 'made' (I've seen this before).
'upside down' shows that the letters should be reversed in order.
'made' written backwards gives 'EDAM'.
(Other definitions for edam that I've seen before include "milk product" , "Cheese made badly" , "Kind of cheese" , "Yellow cheese with a red covering" , "Made (anag) - Dutch cheese" .)