Hymn tune (7)
I believe the answer is:
chorale
'hymn tune' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for chorale that I've seen before include "Lutheran hymn-tune" , "Stately hymn tune" , "vocal music" , "Psalm or hymn tune" , "Harmonised hymn tune" .)