Comes together for tunes I arranged (6)
I believe the answer is:
unites
'comes together' is the definition.
(I've seen this in another clue)
'tunes i arranged' is the wordplay.
'arranged' is an anagram indicator.
'tunes'+'i'='tunesi'
'tunesi' anagrammed gives 'UNITES'.
'for' is the link.
(Other definitions for unites that I've seen before include "Combines" , "Merges" , "Confederates" , "Marries" , "Joins or brings together" .)