Attack a milk producer (4)
I believe the answer is:
goat
'attack' is the definition.
(go at)
'a milk producer' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
The remaining letters 'got' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for goat that I've seen before include "Beast (of Capricorn)" , "beast with sharp horns" , "Billy - nanny" , "nanny, for example" , "Domesticated animal supplying milk, meat and wool" .)