Outlaw some dumb animal (3)
I believe the answer is:
ban
'outlaw' is the definition.
(banning is a kind of outlawing)
'some dumb animal' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'BAN' is hidden in the letters of 'dumb animal'.
(Other definitions for ban that I've seen before include "Exile" , "Censor or proscribe" , "outlaw" , "Bar, prohibition" , "Hungarian governor < to forbid" .)