In German, the melody for a song (6)
I believe the answer is:
anthem
'a song' is the definition.
(anthem is a kind of song)
'in german the melody' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ANTHEM' is hidden in the letters of 'german the melody'.
'for' is the link.
(Other definitions for anthem that I've seen before include "National melody" , "National tune" , "Solemn song" , "The man for a popular song" , "Church choral piece" .)