Quite loud at the end of family party (4,2)
I believe the answer is:
kind of
'quite' is the definition.
(thesaurus)
'loud at the end of family party' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'at the end of' means one lot of letters go next to another.
'family' becomes 'kin' (synonyms).
'party' becomes 'do' (do is a kind of party).
'kin'+'do'='kindo'
'f' after 'kindo' is 'KIND OF'.
(Other definitions for kind of that I've seen before include "Not exactly" , "Somewhat" , "After a fashion" , "Rather" .)