Butter from zebra milk (3)
I believe the answer is:
ram
'butter' is the definition.
(I've seen this before)
'from zebra milk' is the wordplay.
'from' indicates a hidden word.
'RAM' is hidden within 'zebra milk'.
(Other definitions for ram that I've seen before include "needed for PC" , "An animal; forcibly crash into" , "man with many partners?" , "With violence" , "Aries is the Sign of the ..." .)