Goat's dairy product (6)
I believe the answer is:
butter
I believe this is a double definition.
'goat's' is the first definition.
(something which 'butts')
'dairy product' is the second definition.
(butter is a kind of dairy product)
(Other definitions for butter that I've seen before include "Fat - type of fly" , "(and 4) Kind of toffee" , "& 22 Mincepie accompaniment" , "Dairy spread" , "Bread-spread made from milk" .)