Brand new teen drama (9)
I believe the answer is:
trade name
'brand' is the definition.
'new teen drama' is the wordplay.
'new' is an anagram indicator.
'teen'+'drama'='teendrama'
'teendrama' is an anagram of 'TRADENAME'.
(Other definitions for trade name that I've seen before include "label on product" , "Commercial brand" , "By which a company may be recognised" , "Title of a proprietary article or manufacture" , "Neat dream (anag)" .)