Kinky orgy with UHT milk product (7)
I believe the answer is:
yoghurt
'milk product' is the definition.
(I know that yoghurt is a type of milk product)
'kinky orgy with uht' is the wordplay.
'kinky' indicates an anagram.
'with' means one lot of letters go next to another.
'orgy' put after 'uht' is 'uhtorgy'.
'uhtorgy' anagrammed gives 'YOGHURT'.
(Other definitions for yoghurt that I've seen before include "Health food" , "Curdled milk-food" , "Healthy food" , "Curdled milk dish" , "Bacteria-treated milk product" .)