Article uses new Greek hero (7)
I believe the answer is:
theseus
'greek hero' is the definition.
(I've seen this before)
'article uses new' is the wordplay.
'article' becomes 'the' (the definite article).
'new' is an anagram indicator.
'uses' with letters rearranged gives 'seus'.
'the'+'seus'='THESEUS'
(Other definitions for theseus that I've seen before include "Mythical hero" , "Duke in A Midsummer Night's Dream" , "Greek hero" , "Duke of Athens (AMND)" , "Minotaur-slaying hero" .)