Compile new argument (7)
I believe the answer is:
polemic
'argument' is the definition.
(I know that polemic is a type of argument)
'compile new' is the wordplay.
'new' indicates anagramming the letters.
'compile' is an anagram of 'POLEMIC'.
(Other definitions for polemic that I've seen before include "Strong verbal or written attack" , "Speech or writing that fiercely attacks or defends" , "Involving dispute or controversy" , "Passionate argument" , "Fierce argument that attacks or defends an idea" .)