Dairy product from a goat? (6)
This clue is a double definition.
'dairy product' is the first definition.
(butter is a kind of dairy product)
'a goat?' is the second definition.
(I've seen this before)
'from' is the link.
(Other definitions for butter that I've seen before include "Dairy product", "Process of instruction", "& 22 Mincepie accompaniment", "Milk product", "Spread for bread".)