Danny ended piece arranged for the fourth of July (12,3)
I believe the answer is:
independence day
'the fourth of july' is the definition.
(synonyms)
'danny ended piece arranged' is the wordplay.
'arranged' is an anagram indicator (letters rearranged).
'danny'+'ended'+'piece'='dannyendedpiece'
'dannyendedpiece' anagrammed gives 'INDEPENDENCE DAY'.
'for' is the link.
(Other definitions for independence day that I've seen before include "Shot down" , "as one reaches eighteen?" , "Film" , "Summer Holiday celebrated in the US" .)