Balance is bestial, somehow (9)
I believe the answer is:
stabilise
'balance' is the definition.
('balance'->'stabilize' is in my internal thesaurus and 'ize'->'ise')
'is bestial somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'is'+'bestial'='isbestial'
'isbestial' anagrammed gives 'STABILISE'.
(Other definitions for stabilise that I've seen before include "Make of keep steady or balanced" , "Make firm" , "Stop (something) rocking" , "Become less changeable" , "regulate equilibrium" .)