Compile form of argument (7)
I believe the answer is:
polemic
'argument' is the definition.
(I know that polemic is a type of argument)
'compile form' is the wordplay.
'form' indicates an anagram (a different form of the same letters).
'compile' anagrammed gives 'POLEMIC'.
'of' acts as a link.
(Other definitions for polemic that I've seen before include "Fierce spoken or written attack" , "Strong spoken or written attack" , "Strong verbal or written attack" , "Speech or writing that fiercely attacks or defends" , "Fierce argument that attacks or defends an idea" .)