Rage of Zyzzyva? (4,4)
I believe the answer is:
last word
'rage' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for last word that I've seen before include "Final remark in argument" , "Final statement in dispute, often decisive" , "It's state-of-the-art" , "this is finally put across" , "Dernier cri" .)