Fashionable score including a finale (6)
I believe the answer is:
trendy
'fashionable' is the definition.
('trendy' can be similar in meaning to 'fashionable')
'score including a finale' is the wordplay.
'score' becomes 'try'.
'including' means one lot of letters goes inside another.
'a finale' becomes 'end' (I've seen this before).
'try' enclosing 'end' is 'TRENDY'.
(Other definitions for trendy that I've seen before include "Less sensible; a dye plant" , "Chic (colloq.)" , "Cool" , "In vogue" , "In accordance with the latest fad" .)