Dame mad for dairy product (4)
I believe the answer is:
edam
'for dairy product' is the definition.
(Edam is an example)
'dame mad' is the wordplay.
'mad' indicates anagramming the letters.
'dame' is an anagram of 'EDAM'.
(Other definitions for edam that I've seen before include "Yellow cheese with a red covering" , "Made into popular cheese" , "Mild yellow Dutch cheese" , "Cheese made in Holland" , "Round, yellow cheese" .)