Argument — European starts to make it clear (7)
I believe the answer is:
polemic
'argument' is the definition.
(polemic is a kind of argument)
'european starts to make it clear' is the wordplay.
'european' becomes 'pole' (Pole is an example).
'starts to' indicates taking the first letters.
The initial letters of 'make it clear' is 'mic'.
'pole'+'mic'='POLEMIC'
(Other definitions for polemic that I've seen before include "Strong verbal or written attack" , "harangue" , "Controversy; attacking speech" , "Involving dispute or controversy" , "Involving controversy -- compile (anag)" .)