Infuriated and enraged, going berserk (7)
I believe the answer is:
angered
'infuriated' is the definition.
('angered' can be a synonym of 'infuriated')
'enraged going berserk' is the wordplay.
'going berserk' is an anagram indicator.
'enraged' anagrammed gives 'ANGERED'.
'and' is the link.
(Other definitions for angered that I've seen before include "En garde (anag.)" , "Infuriated" , "Enraged (anag)" , "Very annoyed" , "In high dudgeon" .)