Go wild with animal in bush (8)
I believe the answer is:
magnolia
'bush' is the definition.
(I know that Magnolia is a bush)
'go wild with animal' is the wordplay.
'wild with' indicates an anagram.
'go' anagrammed with 'animal' can make 'MAGNOLIA'.
'in' acts as a link.
(Other definitions for magnolia that I've seen before include "Spring-flowering tree" , "5" , "Spring-flowering shrub" , "Omani lag (anag)" , "Mississippi, the ___ State - tree or shrub" .)