Portuguese folk music initially fine at a party (4)
I believe the answer is:
fado
'portuguese folk music' is the definition.
(genre of music)
'initially fine at a party' is the wordplay.
'initially' says to take the initial letters.
'at' says to put letters next to each other.
'party' becomes 'do' (do is a kind of party).
The initial letter of 'fine' is 'f'.
'f'+'a'+'do'='FADO'
(Other definitions for fado that I've seen before include "Portuguese traditional dance and doleful song" , "Melancholy style of song popular in Portugal" , "Popular Portuguese song, often melancholy" , "Portuguese folk song" , "Portuguese song genre" .)